He is a hard man who is only just, and a sad one who is only wise. Voltaire
French author, humanist, rationalist, & satirist (1694 - 1778) It is characteristic of wisdom not to do desperate things. Henry David Thoreau
US Transcendentalist author (1817 - 1862) A thing worth having is a thing worth cheating for. W. C. Fields
US actor (1880 - 1946) Water is the only drink for a wise man. Henry David Thoreau
US Transcendentalist author (1817 - 1862) The wise man avoids evil by anticipating it. Publilius Syrus
(~100 BC) Wisdom is the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom. Charles Haddon Spurgeon
English preacher (1834 - 1892) Practical wisdom is only to be learned in the school of experience. Precepts and instruction are useful so far as they go, but, without the discipline of real life, they remain of the nature of theory only. Samuel Smiles Wisdom does not show itself so much in precept as in life - in firmness of mind and a mastery of appetite. It teaches us to do as well as to talk; and to make our words and actions all of a color. Seneca
Roman dramatist, philosopher, & politician (5 BC - 65 AD) Nine-tenths of wisdom consists in being wise in time. Theodore Roosevelt
26th president of US (1858 - 1919) Wisdom is the principal thing, therefore get wisdom; and with all thy getting, get understanding. Bible, Proverbs, 4:7 | 
