Faith, as from the Canaanite Woman in Matthew 15

'This woman is next of all an example to those who think they have been repulsed in their endeavours after salvation. Have you been praying, and have you not succeeded? Have you sought the Lord, and do you seem to be more unhappy than ever? Have you made attempts at reformation and amendment, and believed that you made them in the divine strength, and have they failed? Yet trust in Him whose blood has not lost its efficacy, whose promise has not lost its truth, and whose arm has not lost its power to save. Cling to the cross, sinner. If the earth sink beneath thee, cling on; if storms should rage, and all the floods be out, and even God Himself seem to be against thee, cling to the cross. There is thy hope. Thou canst not perish there.'
-Humility and How to Get It by Charles Spurgeon