If you have learned how to disagree without being disagreeable, then you have discovered the secrete of getting along - whether it be business, family relations, or life itself. Bernard Meltzer
Don't flatter yourselves that friendship authorizes you to say disagreeable things to your intimates. On the contrary, the nearer you come into relation with a person, the more necessary do tact and courtesy become. Oliver Wendell Holmes, Sr.
Yes, we are all different. Different customs, different foods, different mannerisms, different languages, but not so different that we cannot get along with one another. If we will disagree without being disagreeable. J. Martin Kohe
The excellency of every art is its intensity, capable of making all disagreeable evaporate. John Keats
I know of no more disagreeable situation than to be left feeling generally angry without anybody in particular to be angry at. Frank Moore Colby