The probability of a response is determined by its reinforcement history.
幸福是生活的良好流动,一种深信自己参与了宇宙目的的信念。
The best thing you can do is just be yourself and have fun.
I'm not a smart man, but I know what love is.
Quality is never an accident; it is always the result of intelligent effort.
Change starts when you stop blaming the darkness and light a candle.