“One leak will sink a ship, and one sin will destroy a sinner.”

Compare Poor Richard's Almanack (1745) : Beware of little Expences, a small Leak will sink a great Ship.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

From ‘’Justice’’ in Unspoken Sermons Series III (1889)
Context: If sin must be kept alive, then hell must be kept alive; but while I regard the smallest sin as infinitely loathsome, I do not believe that any being, never good enough to see the essential ugliness of sin, could sin so as to deserve such punishment. I am not now, however, dealing with the question of the duration of punishment, but with the idea of punishment itself; and would only say in passing, that the notion that a creature born imperfect, nay, born with impulses to evil not of his own generating, and which he could not help having, a creature to whom the true face of God was never presented, and by whom it never could have been seen, should be thus condemned, is as loathsome a lie against God as could find place in heart too undeveloped to understand what justice is, and too low to look up into the face of Jesus.

October 27, 1882, to Keshub Chunder Sen. The Gospel of Sri Ramakrishna, Volume 1, Madras, 1985, p. 138. Quoted from Goel, S. R. (2016). History of Hindu-Christian encounters Ch.13
The Gospel of Sri Ramakrishna (1942)

Source: Discipleship (1937), The Disciple and Unbelievers, p. 184.

The Unsearchable Riches of Christ

Vogue, 1990

This is variant of a traditional Christian proverb; ie: "Hate the sin, but love the sinner" in Sermons, Lectures, and Occasional Discourses (1828) Edward Irving http://books.google.co.uk/books?id=VwUeH-wTxZ8C&pg=PA132, and similar expressions date to those of Augustine of Hippo: "Love the sinner and hate the sin." Gandhi did express approval of such sentiments in his An Autobiography (1927): "Hate the sin and not the sinner" is a precept which, though easy enough to understand, is rarely practiced, and that is why the poison of hatred spreads in the world.
Misattributed