When thou art uncertain in transacting an affair, select that portion of it which will entail no danger to thee.
Speak not harshly to a man of gentle speech.
Seek not to fight with him who knocks at the door of peace.
Saadi Shirazi
http://www.poemhunter.com/poem/ch-08-on-rules-for-conduct-in-life-admonition-07/
