光波,无论是以太波还是其他波,在所有情况下都是时间上的周期性过程。
A happy person is not a person in a certain set of circumstances, but rather a person with a certain set of attitudes.
“物质”不是唯一的事实标准:还存在心理事实,而且无法以任何的物质方式来解释、证明、或辩驳它。
Do just once what others say you can't do, and you will never pay attention to their limitations again.
我从不考虑错失关键球的后果……当你考虑后果时,你很可能会失误。
Leadership is about inspiring others to see what they can become.