This moral liberty a man may have, though it do not extend to all his actions, or even to all his voluntary actions. He does many things by instinct, many things by the force of habit without any thought at all, and consequently without will. In the first part of life, he has not the power of self-government, any more than the brutes. That power over the determinations of his own will, which belongs to him in ripe years, is limited, as all his powers are; and it is perhaps beyond the reach of his understanding to define its limits with precision. We can only say, in general, that it extends to every action for which he is accountable.
This power is given by his Maker, and at his pleasure whose gift it is. It may be enlarged or diminished, continued or withdrawn. No power in the creature can be independent of the Creator. His hook is in its nose; he can give it line as far as he sees fit, and, when he pleases, can restrain it, or turn it whithersoever he will. Let this be always understood, when we ascribe liberty to man or to any created being.
Supposing it therefore to be true, That man is a free agent it may be true, at the same time that his liberty may be impaired or lost by disorder of body or mind, as in melancholy or in madness; it may be impaired or lost by vicious habits; it may in particular cases be restrained by divine interposition.
We call man a free agent in the same way as we call him a reasonable agent. In many things he is not guided by reason, but by principles similar to those of the brutes. His reason is weak at best. It is liable to be impaired or lost, by his own fault, or by other means. In like manner, he may be a free agent, though his freedom of action may have many similar limitations.