All I can do is follow my instincts, because I'll never please everyone.

语出（南宋）崔敦礼《刍言》。自以为聪明的人，其实并不聪明；自以为能干的人，其实并不能干。

I don’t like to be told what I can’t do.

The P versus NP problem is one of the most important unsolved problems in computer science.

The teacher is not in school to impose certain ideas or to form certain habits in the child, but is there as a member of the community to select the influences which shall affect the child and to assist him in properly responding to those influences.

All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter into another.