Time flies when you are having fun.

I have become an obstinate heretic in the eyes of my colleagues. Momentary success carries more power of conviction than reflections upon principles.

If you are out to describe the truth, leave elegance to the tailor.

On the other hand, the concept owes its meaning and its justification exclusively to the totality of the sense impressions which we associate with it.

In the view of such harmony in the cosmos which I, with my limited human mind, am able to recognize, there are yet people who says there is no God. But what makes me really angry is that they quote me for support of such views. (The Expanded Quotable Einstein, Princeton University, page 214)

The belief in an external world independent of the perceiving subject is the basis of all natural science. Since, however, sense perception only gives information of this external world or of "physical reality" indirectly, we can only grasp the latter by speculative means. It follows from this that our notions of physical reality can never be final. We must always be ready to change these notions - that is to say, the axiomatic basis of physics - in order to do justice to perceived facts in the most perfect way.

Education is what is left after you've forgotten everything you've learned.