I am always inspired by George Whitefield. What it must have been like to hear this (physically) little man preach the gospel to tens of thousands before the days of headworn condenser microphones!
I just came across this quote from one of his sermons (the full sermon is at the link below).
"True repentance will entirely change you, the bias of your souls will be changed..you will delight in God, in Christ..his law..his people" -- George Whitefield (Cf. Luke 13:3b -- "but unless you repent, you will all likewise perish.")