A passage from Seneca
Seneca, On Providence 1.1
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You have asked me, Lucilius, why, if the world is governed by Providence, so many evils befall good men. This question would not be asked if you knew that the good are good only because they are tried.
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'
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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.