He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never read more

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

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.

Have the courage to say no. Have the courage to face the truth. Do the right thing because it is read more

Have the courage to say no. Have the courage to face the truth. Do the right thing because it is right. These are the magic keys to living your life with integrity.

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

Integrity is doing the right thing, even if nobody is watching.

Integrity is doing the right thing, even if nobody is watching.

A theory has only the alternative of being right or wrong. A model has a third possibility - it may read more

A theory has only the alternative of being right or wrong. A model has a third possibility - it may be right but irrelevant.

[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.

A theory is no more like a fact than a photograph is like a person.

A theory is no more like a fact than a photograph is like a person.

The most important persuasion tool you have in your entire arsenal is integrity.

The most important persuasion tool you have in your entire arsenal is integrity.