He erred, no doubt, perhaps he sinned;
Shall I then dare to cast a stone?
Perhaps this blotch on a garment white,
Counts less than the dingy robes I own. - George Houghton.
I love this short poem, it slaps me in the face and begs me to stand ready. The battle when one has been a Christian for years is to maintain that first love. The following piece by John Newton adds another side to the same issue --
"And, I believe, the over doings of a young convert, proceeding from an honest simplicity of heart and a desire of pleasing the Lord, are more acceptable in His sight than a certain coolness of conduct which frequently takes place afterward, when we are apt to look back with pity upon one former weakness and secretly to applaud ourselves for our present greater attainments in knowledge, though perhaps (alas, that it should ever be so!) we may have lost as much in warmth as we have gained in light."
"Wake up, O sleeper, rise from the dead, and Christ will shine on you." Eph. 514