A passage from Seneca
Seneca, On Providence 6.1
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No man is more unhappy than he who never faces adversity. For he is not permitted to prove himself. The highest proof of virtue is to bear the loss of all things without sorrow.
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.