C.N. Douglas, comp. Forty Thousand Quotations: Prose and Poetical. 1917.
Utility
Use almost can change the stamp of nature.
Shakespeare.
The superfluous, a thing highly necessary.
Voltaire.
Longfellow.
The use of a thing is only a part of its significance. To know anything thoroughly, to have the full command of it in all its appliances, we must study it on its own account, independently of any special application.
Goethe.
Of all parts of wisdom, the practice is the best. Socrates was esteemed the wisest man of his time because he turned his acquired knowledge into morality, and aimed at goodness more than greatness.
Tillotson.