Charles H. Spurgeon on Psalms 141:5

It shall be an excellent oil, which shall not break my head. Some persons pride themselves on being blunt, or, as they call it, "honest"; but very blunt people do little good to others, and get little love to themselves. The Scriptures recommend gentleness and kindness. Reproof should fall like the dew, and not like the rushing hailstorm. The "oil" insinuates itself; the stone wounds and then rebounds. Christians should take heed of getting fond of the work of "rebuking." Such "spiritual constables" do a great deal of mischief without intending it. They are in a church what a very witty and sarcastic person is in society, or what a tell tale is in a school; and approximate very closely to that class which the apostle terms "busy bodies in other men's matters." Our manner must be tender and winning. The nail of reproof, says an old writer, must be well oiled in kindness before it is driven home. Meddling with the faults of others is like attempting to move a person afflicted with the rheumatic gout: it must be done slowly and tenderly, nor must we be frightened by an out cry or two. The great thing is to show the person that you really love him; and if you manifest this in the sight of God, he will bless your efforts, and give you favour in the sight of an erring brother. —Christian Treasury.