Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

I never once made a discovery ... I speak without exaggeration that I have constructed three thousand different theories in read more

I never once made a discovery ... I speak without exaggeration that I have constructed three thousand different theories in connection with the electric light ... Yet in only two cases did my experiments prove the truth of my theory.

You have to know you can first. How comes later.

You have to know you can first. How comes later.

It is curious - curious that physical courage should be so common in the world, and moral courage so rare

It is curious - curious that physical courage should be so common in the world, and moral courage so rare

In scientific work, those who refuse to go beyond fact rarely get as far as fact.

In scientific work, those who refuse to go beyond fact rarely get as far as fact.

[Do not] put too much confidence in experimental results until they have been confirmed by theory.

[Do not] put too much confidence in experimental results until they have been confirmed by theory.

The right to swing my fist ends where the other man’s nose begins.

The right to swing my fist ends where the other man’s nose begins.

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very read more

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very idle.

There is a theory which states that if ever for any reason anyone discovers what exactly the Universe is for read more

There is a theory which states that if ever for any reason anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.