To give real service you must add something which cannot be bought or measured with money, and that is sincerity and integrity. Douglas Adams
Through mutual understanding, sincerity and goodwill, and with great wisdom and broad views, the leaders on both sides should jointly initiate new opportunities for peace, stability, cooperation and mutual benefit. Chen Shui-bian
Originality is independence, not rebellion; it is sincerity, not antagonism. George Henry Lewes
Fear is not in the habit of speaking truth; when perfect sincerity is expected, perfect freedom must be allowed; nor has anyone who is apt to be angry when he hears the truth any cause to wonder that he does not hear it. Tacitus
By sincerity, a man gains physical, mental and linguistic straightforwardness, and harmonious tendency; that is, congruence of speech and action. Mahavira