Charles H. Spurgeon on Psalms 19:12

Our corruptions have made us such combustible matter, that there is scarce a dart thrown at us in vain: when Satan tempts us, it is but like the casting of fire into tinder, that presently catcheth: our hearts kindle upon the least spark that falls; as a vessel that is brimful of water, upon the least jog, runs over. Were we but true to ourselves, though the devil might knock by his temptations, yet he could never burst open the everlasting doors of our hearts by force or violence; but alas! we ourselves are not all of one heart and one mind: Satan hath got a strong party within us, that, as soon as he knocks, opens to him, and entertains him. And hence it is, that many times, small temptations and very petty occasions draw forth great corruptions: as a vessel, that is full of new liquor, upon the least vent given, works over into foam and froth; so truly, our hearts, almost upon every slight and trivial temptation, make that inbred corruption that lodgeth there, swell and boil, and run over into abundance of scum and filth in our lives and conversations. —Ezekiel Hopkins.