You must look into other people as well as at them. Lord Chesterfield

A good deed is never lost: he who sows courtesy reaps friendship; and he who plants kindness gathers love.
Basil

Charity, good behaviour, amiable speech, unselfishness these by the chief sage have been declared the elements of popularity.
Burmese Proverb

Kind words are the music of the world.
F. W. Faber

We are far more liable to catch the vices than the virtues of our associates.
Denis Diderot

Arguing with a fool proves there are two.
Doris M. Smith

Be courteous to all, but intimate with few;
and let those be well-tried before you give them your confidence.
George Washington

Learn to regard the souls around you as parts of some grand instrument. It is for each of us to know the keys and stops, that we may draw forth the harmonies that He sleeping in the silent octaves.
Anonymous

A good word is an easy obligation; but not to speak ill requires only our silence; which costs us nothing.
John Tillotson

It requires less character to discover the faults of others than is does to tolerate them.
J. Petit Senn

Do not forget small kindnesses and do not remember small faults.
Chinese Proverb