Optimism thrives, pessimism wanes.

Meaning: When people are optimistic, their positive attitude grows stronger and negative thinking becomes weaker.

Choice of Words: Optimism is the tendency to be hopeful and positive about the future. Thrives means to grow or develop well or vigorously. Pessimism is the tendency to be negative and expect the worst. Wanes means to gradually decrease or become weaker. When you put them together, the sentence suggests that a positive outlook on life can flourish and overcome negative thinking.

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