(Jer: 17:9) The heart is deceitful above all things, and desperately wicked: who can know it?

It is full of turnings and windings, nooks and corners, wiles and sleights. It deceived David, as wise as he was, and tripped up his heels, as the word here used importeth; {#Ps 39:1-3} so it did Peter. {#Joh 13:37,38} Fitly doth the prophet here call our hearts “deceitful,” in that word in the original, from whence Jacob had his name, because our fleshly hearts do the same things to the spirit in doing of good, which Jacob did to his brother—supplant it and catch it by the heel while it is running the Christian race.