我已经注意到有爬山习惯的年轻人长大后通常有所作为。
I have noticed that youngsters given to the climbing habit usually do something when they grow up.
亲戚都不归附,也就不要对外办交际。 
Pessimism leads to weakness, optimism to power.
The best way to learn mathematics is to do mathematics.
你必须愿意承担风险。如果你不愿意,你就赚不到钱。