Nature seems at each man's birth to have marked out the bounds of his virtues and vices, and to have determined how good or how wicked that man shall be capable of being.
No man deserves to be praised for his goodness, who has it not in his power to be wicked. Goodness without that power is generally nothing more than sloth, or an impotence of will.
Nothing is impossible; there are ways that lead to everything, and if we had sufficient will we should always have sufficient means. It is often merely for an excuse that we say things are impossible.