We can't solve today's problems with the mentality that created them.
We cannot get to where we dream of being tomorrow unless we change our thinking today.
We will never be able to solve the problems of tomorrow with the thinking of today
If tomorrow were never to come, it would not be worth living today.
Insofar as we may at all claim that slavery has been abolished today, we owe its abolition to the practical consequences of science
Every reminiscence is colored by the way things are today, and therefore by a delusive point of view.
The problems of today can only be solved at a higher level of thinking than that which created them