From a letter by John Newton:
"Knowing that the Gospel is the wisdom and power of God, and the only possible means by which fallen man can obtain peace with God—he (the mature Christian) most cordially embraces and avows it. Far from being ashamed of it—he esteems it his glory. He preaches Christ Jesus, and Him crucified. He disdains the thought of distorting, disguising, or softening the great doctrines of the grace of God, to render them more palatable to the depraved taste of the times (2 Corinthians 4:2). And he will no more encounter the errors and corrupt maxims and practices of the world, with any weapon but the truth as it is in Jesus—than he would venture to fight an enraged tiger with a paper sword!"
HT: Grace Gems