It is a proverb that "courtesy costs nothing"; but calculation might come to value love for its profit. Love is fabled to be blind, but kindness is necessary to perception; love is not a hood, but an eye-water.
- Ralph Waldo Emerson
Discretion plays a major part in making up the salesman's art, for truths that no one can believe are calculated to deceive.
- Dorothy Sayers
No man acquires property without acquiring with it a little arithmetic also.
- Ralph Waldo Emerson
All our fret and worry is caused by calculating without God.