Aphorism

1. A tersely phrased statement of a truth or opinion; an adage.
2. A brief statement of a principle.

aphorism (?f'?r?z'?m) , short, pithy statement of an evident truth concerned with life or nature; distinguished from the axiom because its truth is not capable of scientific demonstration. Hippocrates was the first to use the term for his Aphorisms, briefly stated medical principles. Note his famous opening sentence: “Life is short, art is long, opportunity fleeting, experimenting dangerous, reasoning difficult.”