The Savior himself said, "I can of myself do nothing." The wonderful power which was manifested in him, in his incarnate state, had its source in his Father, from whom, in the exercise of faith, he continually drew divine strength. [See Acts, Ch. 1:3, and other passages of similar import.] The language of Paul and of other holy men, who derived their strength from God through Christ, is, "I can do all things through Christ which strengtheneth me." Philipp. 4: 13.
There is an inward conviction, a consciousness felt in the depths of the pious man's spiritual nature, that virtue has a necessary alliance with power, and that the good man never, can be deserted. God, who inspires this remarkable conviction, is pledged, both by nature and by promise, to see it realized. And thus the man of God, who feels this increased strength, finds that easy which would otherwise be hard to him.
— edited from A Treatise on Divine Union (1851) Part 8, Chapter 7.