John Whitlock was a minister of the gospel in Nottingham, England. Here are 9 sermons on Psalm 18:23: "I was also upright before him and I kept myself from mine iniquity."
Whitlock shows that some men have some sins that are unique to them. That is why David prays to be kept from his iniquity. He shows the difference between a reigning sin and a tyrannizing corruption. This is Puritan pastoral counselling at it's very best.
Appdenixed are Whitlock's farewell sermon from Rev. 3:3 and his funeral sermon preached upon his death in 1793.