I. The Nature and Definitions of the Free Power of Choice
"By the freedom of the will is meant, a liberty in the will of its own accord to choose or refuse; to do or not to do; to do this, or to do that, without any constraint or force from any one." [Thomas Vincent - The Shorter Catechism]
"the soul consists of two parts, the intellect and the will, (Book 2 chap. 2 sec. 2, 12,) - the office of the intellect being to distinguish between objects, according as they seem deserving of being approved or disapproved; and the office of the will, to choose and follow what the intellect declares to be good, to reject and shun what it declares to be bad" [John Calvin - Institutes]
"freedom is opposed to constraint, and is a quality of the will, or a natural power of an intelligent creature, concurring with the will; that is, it is the power of choosing or refusing, of its own accord, and without any constraint, an object presented by the understanding, the nature of the will remaining the same, and being free to choose this or that, or to defer any action it may see fit" "Free power of choice is therefore the faculty or power of willing or not willing, of choosing or rejecting an object presented by the understanding, of its own accord, and without any constraint." [Zacharias Ursinus - Commentary on the Heidelberg]
"In this upright state, man possessed freedom of will, by which, if he chose, he was able to obtain eternal life." "Thus simply to will is the part of man, to will ill the part of corrupt nature, to will well the part of grace." [John Calvin - Institutes]
"Believing is an act of the understanding, is an immediate, not mediated by proofs, attachment of consciousness to revelation. But that faith presupposes a change in the relation of the whole human being to God, it presupposes regeneration, the conversion of the will. Nemo credit nisi volens." [Herman Bavinck - Reformed Dogmatics]
II. The Freedom of the Will in Man's Fourfold State
"the degrees of free-will may be considered, and distinguished most correctly, according to the fourfold state of man, viz: as not yet fallen into sin—as fallen—as regenerated—and as glorified"
"The first degree of liberty is that which belonged to man before the fall. This consisted in a mind enlightened with the perfect knowledge of God, and a will yielding entire obedience to God by its own voluntary act and inclination; and yet not so confirmed in this knowledge and obedience, but that it might fall by its own free exercise"
"The second degree of free power of choice is that which belongs to man as a fallen being, born of corrupt parents, and unregenerated. In this state the will does indeed act freely, but it is disposed and inclined only to that which is evil, and can do nothing but sin." [Zacharias Ursinus - Commentary on the Heidelberg]
"The will may be said to be free only unto sin; and thus the wills of all the children of men in the world, whilst in a state of nature, are free only unto sin." [Thomas Vincent - The Shorter Catechism]
"Man, since he was corrupted by the fall, sins not forced or unwilling, but voluntarily, by a most forward bias of the mind; not by violent compulsion, or external force, but by the movement of his own passion; and yet such is the depravity of his nature, that he cannot move and act except in the direction of evil." [John Calvin - Institutes]
"The third degree of free power of choice is that which belongs to a man as regenerated, but not as yet perfected and glorified. In this state the will uses its liberty, not only for doing that which is evil, as is true of man before his regeneration, but here the will does both the good and the evil in part."
"The fourth degree of free power of choice, is that which belongs to man after this life, in a state of glorification; or as perfectly regenerated. In this state, the will of man will be free to choose only the good, and not the evil. This will be the highest degree, or the perfect liberty of the human will, when we shall obey God fully and forever." [Zacharias Ursinus - Commentary on the Heidelberg]
III. The Distinction Between Necessity and Compulsion
"Moreover, when I say that the will, deprived of liberty, is led or dragged by necessity to evil, it is strange that any should deem the expression harsh, seeing there is no absurdity in it, and it is not at variance with pious use. It does, however, offend those who know not how to distinguish between necessity and compulsion." [John Calvin - Institutes]
"For it is not immutability, but constraint; or it is not the necessity of unchangeableness, but that of constraint which take away liberty. God is unchangeably and necessarily good, and yet he is at the same time most freely good: the devils are unchangeably and necessarily evil; and yet they are evil, and do that which is evil with the greatest freedom of the will." [Zacharias Ursinus - Commentary on the Heidelberg]
IV. The Three Essential Parts of Christian Liberty
"Christian liberty seems to me to consist of three parts. First, the consciences of believers, while seeking the assurance of their justification before God, must rise above the law, and think no more of obtaining justification by it."
"Another point which depends on the former is, that consciences obey the law, not as if compelled by legal necessity; but being free from the yoke of the law itself, voluntarily obey the will of God." [John Calvin - Institutes]
"The third part of this liberty is that we are not bound before God to any observance of external things which are in themselves indifferent (Adiaphora), but that we are now at full liberty either to use or omit them."
"The moral law has, as it respects one part, been abrogated by Christ... 1. The curse of the law has been removed as it respects those who are justified by faith in Christ, in consequence of having his merits imputed unto them; or it may be said that the law has been abrogated as touching justification... 2. The law has been abrogated in reference to Christians, as it respects constraint. The law no longer forces and wrests obedience as a tyrant, or as a master compels a worthless servant to render obedience to his behests; because Christ commences in us by his Spirit a free and cheerful obedience, so that we willingly comply with whatever the law requires from us." [Zacharias Ursinus - Commentary on the Heidelberg]
V. The Liberty of Conscience Over Against Human Authority
"Therefore conscience is sacrosanct and freedom of conscience an inexorable demand and an inalienable right." [Herman Bavinck - Reformed Dogmatics]
"Since by means of this privilege of liberty which we have described, believers have derived authority from Christ not to entangle themselves by the observance of things in which he wished them to be free, we conclude that their consciences are exempted from all human authority."
"Wherefore, as works have respect to men, so conscience bears reference to God, a good conscience being nothing else than inward integrity of heart." [John Calvin - Institutes]
"As long, therefore, as the order of the church is not violated, and offence is not given, the conscience of every one ought to be left free; for it is sometimes necessary, not on account of the command of the church, or of the ministry, but for just causes to do, or to omit things which are indifferent." [Zacharias Ursinus - Commentary on the Heidelberg]