Do not criticize, condemn, or complain. Those 3 C’s make up the first technique of working with people, from Dale Carnegie’s book “How to Win Friends and Influence People”. In that book he tells the story below to emphasize the point.
“I made a special study of Lincoln’s method of dealing with people. Did he indulge in criticism? Oh, yes. As a young man in the Pigeon Creek Valley of Indiana, he not only criticized but he wrote letters and poems ridiculing people and dropped these letters on the country roads where they were sure to be found. One of these letters aroused resentments that burned for a lifetime.
Even after Lincoln had become a practicing lawyer in Springfield, Illinois, he attacked his opponents openly in letters published in the newspapers. But he did this just once too often.
In the autumn of 1842 he ridiculed a vain, pugnacious politician by the name of James Shields. Lincoln lamned him through an anonymous letter published in Springfield Journal. The town roared with laughter. Shields, sensitive and proud, boiled with indignation. He found out who wrote the letter, leaped on his horse, started after Lincoln, and challenged him to fight a duel. Lincoln didn’t want to fight. He was opposed to dueling, but he couldn’t get out of it and save his honor. He was given the choice of weapons. Since he had very long arms, he chose cavalry broadswords and took lessons in sword fighting from a West Point graduate; and, on the appointed day, he and Shields met on a sandbar in the Mississippi River, prepared to fight to the death; but, at the last minute, their seconds interrupted and stopped the duel.
That was the most lurid personal incident in Lincoln’s life. It taught him an invaluable lesson in the art of dealing with people. Never again did he write an insulting letter. Never again did he ridicule anyone. And from that time on, he almost never criticized anybody for anything.”