The deep roots of unbelief

“So deeply rooted in our hearts is unbelief, so prone are we to it, that while all confess with the lips that God is faithful, no man ever believes it without an arduous struggle. ... Certainly, whenever God thus recommends his word, he indirectly rebukes our unbelief, the purport of all that is said being to eradicate perverse doubt from our hearts." 
John Calvin, Institutes Christian Religion 3.2.15 
HT: Graced Again