" There was no doubt that if faith did not fail, God would not fail; but, then, what if one's faith should prove insufficient? I had not at that time learned that even "if we believe not, He abideth faithful, He cannot deny Himself"; and it was consequently a very serious question to my mind, not whether He was faithful, but whether I had strong enough faith to warrant my embarking in the enterprise set before me. "
― James Hudson Taylor , Hudson Taylor