Few things tend more to alienate friendship than a want of punctuality in our engagements. I have known the breach of a promise to dine or sup to break up more than one intimacy. William Hazlitt
Nothing is as easy to make as a promise this winter to do something next summer; this is how commencement speakers are caught. Sydney J. Harris
Those that are most slow in making a promise are the most faithful in the performance of it. Jean-Jacques Rousseau
A promise is a cloud; fulfillment is rain. Arabic Proverb
A promise is a nice word, if kept then it is all right. Hungarian Proverb
The world has not made a promise to anybody. African Proverb