The law of HABIT, in its application to the principles of the mind, may be expressed by saying, that it is the facility and strength of action, resulting from frequent exercise or repetition. The perceptive powers, the memory, the power of reasoning, the affections, all invigorate themselves under the influence of this mighty law. The same can be said of faith. Faith unexercised, becomes weak; faith, in frequent exercise, becomes strong. He, who believes frequently, will believe energetically; while he, who puts forth the act of belief only at distant intervals, will find the impotency of his faith corresponding to the infrequency of its exercise.
And, in accordance with this general view, it is related of some pious persons, who have distinctly seen the connection between a strong faith, and the life of God in the soul, that they have endeavored to sustain and strengthen acts of faith, by acts of the will. Taught by an experience, which had already cost them much, that, in the language of an English poet,
—— "Our doubts are traitors,
"And make us lose the good we oft might win,
"By fearing to attempt,"
they have determined to meet and resist the treachery of unbelief by the religious patriotism, if we may so express it, of a fixed resolve. Their language has been, “I will believe.” “I am determined not to doubt.”
— edited from The Life of Faith (1852) Part 1, Chapter 12.