出自先秦《荀子·非相》。赠人以有益之言，比赠人以金石珠玉更显珍贵。说明有益的建言对他人事业人生的助益作用。
The only limit to our realization of tomorrow is our doubts of today.
You may not be able to alter reality, but you can alter your attitude towards it, and this, paradoxically, alters reality.