The true value of stone lies in how we transform it for human use.

The secret of change is to focus all of your energy not on fighting the old, but on building the new.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

Sustainability isn't just about planting trees; it's about planting the right trees in the right places for the right reasons.

The most perfect education, in my opinion, is such an exercise of the understanding as is best calculated to strengthen the body and form the heart.

勇气不是没有恐惧，而是战胜恐惧。