Every technological breakthrough is a challenge to the limits.

The only limit to our realization of tomorrow is our doubts of today.

The past is a shadow that follows us, but it is our choice whether to let it define us or to step into the light.

Mental processes are means to ends in the struggle for existence.

孔子说：“三人走路，必有人可作为我的老师。选择他的优点向他学习，借鉴他的缺点进行自我改正。”