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寧靜致遠 is an ancient Chinese idiom that means “tranquility yields transcendence.”
This suggests pursuing a quiet life of profound study.
The first two characters mean tranquility. The last two characters mean “go far,” which suggests achieving much in your life or expanding beyond normal limits. The direct translation would read something like, “[With] tranquility [in your life, you'll] go far.”
Compare this to the English idiom: Still waters run deep.