The advice for good human relations comes from some unknown old cookbook, written by the "famous" unknown author. The advice stands well today, I think.
The Best Advice for Human Relations
Smile At People — it takes 72 muscles to frown, only 14 to smile.
Call People — the sweetest music to anyone’s ears is the sound of his own name.
Be Friendly and helpful, if you would have friends, be a friend.
Be Cordial — speak and act as if everything you do is a genuine pleasure.
Be Genuinely interested in people — you can like almost everybody if you try.
Be Generous with praise — cautious with criticism.
Be Considerate with the feelings of others — there are usually three sides to a controversy: yours, the other fellow’s, and the right side.
Be Alert to give service — what counts most in life is what we do for others.
Add To This a good sense of humour, a big dose of patience and a dash of humility, and you will be rewarded many-fold.
Go forth and be nice. Meanwhile .... keep it simple and make it real.