A person who never made a mistake never tried anything new.
Life is like riding a bicycle. To keep your balance, you must keep moving.
I must be willing to give up what I am in order to become what I will be.
It's not that I'm so smart, it's just that I stay with problems longer.
Imagination is everything. It is the preview of life's coming attractions. Imagination is more important than knowledge. Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts.
Mankind must give up war in the Atomic Era. What is at stake is the life or death of humanity.
In their struggle for the ethical good, teachers of religion must have the stature to give up the doctrine of a personal god.
In their struggle for the ethical good, teachers of religion must have the stature to give up the doctrine of a personal god, that is, give up that source of fear and hope which in the past placed such vast power in the hands of priests. In their labors they will have to avail themselves of those forces which are capable of cultivating the Good, the True, and the Beautiful in humanity itself. This is, to be sure, a more difficult but an incomparably more worthy task.
I am not more gifted than anybody else. I am just more curious than the average person and I will not give up a problem until I have found the proper solution.
It must be conceded that a theory has an important advantage if its basic concepts and fundamental hypotheses are 'close to experience,' and greater confidence in such a theory is certainly justified. There is less danger of going completely astray, particularly since it takes so much less time and effort to disprove such theories by experience. Yet more and more, as the depth of our knowledge increases, we must give up this advantage in our quest for logical simplicity in the foundations of physical theory.
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