Psychology's task is to explain how mind serves life.
机会不会自己发生；你要创造它们。
The only limit to our realization of tomorrow will be our doubts of today.
The bond market is the most important market in the world.
解析：教导学生，不到他想弄明白而不得的时候，不去开导他；不到他想出来却说不出来的时候，不去启发他。