“You will thus understand that what you fear is either insignificant or short-lived.”
Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XXIV: On despising death
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Seneca the Younger 225
Roman Stoic philosopher, statesman, and dramatist -4–65 BCRelated quotes
and those require mathematics
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
“Life's got to be lived, no matter how long or short. You got to take what comes.”
Source: Tuck Everlasting

I. On the Theoretical Understanding of Human Conduct
On Human Conduct (1975)
“Everything you do is triggered by an emotion of either desire or fear.”

“Life is short. Short, and not about anything except what you can touch and what touches you.”