The only limit to our realization of tomorrow will be our doubts of today.
实现明天理想的唯一障碍是今天的疑虑。
Sustainability isn't an option; it's a necessity for the future of energy.
The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.
Mathematics is an art, and as an artist, you have to be honest with yourself.
生命中最伟大的荣耀不在于永不跌倒，而在于每次跌倒后都能站起来。
Quality should never be compromised for quantity.