I am not much of a ...

I am not much of a mathematician," said the cigarette, "but I can add to a man's nervous troubles, I can subtract from his physical energy, I can multiply his aches and pains, I can divide his mental powers, I take interest from his work, and discount his chances for success.
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 David Starr Jordan

Quotes from the same author

Wisdom is knowing. Skill is know how to do it. Virtue is doing it.
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 David Starr Jordan
Whatever is not nailed down is mine." This is the motto of the exploiter. "Whatever can be pried loose is not nailed down." This is the second maxim in a country where people are rich, caring little in their present prosperity what shall become of the future.
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 David Starr Jordan
Wisdom is knowing what to do next; virtue is doing it.
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 David Starr Jordan
The physiological law of Transfer of Energy is the basis of human success and happiness. There is no action without expenditure of energy, and if energy be not expended the power to generate it is lost. This law shows itself in a thousand ways in the life of man. The arm which is not used becomes palsied. The wealth which comes by chance weakens and destroys. The good which is unused turns to evil. The charity which asks no effort cannot relieve the misery she creates.
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 David Starr Jordan