You do not sing because you're happy, you're happy because you sing.

A man may not achieve everything he has dreamed, but he will never achieve anything great without having dreamed it first.

Our theories are wedged and controlled as nothing else is. Yet sometimes alternative theoretic formulas are equally compatible with all the truths we know, and then we choose between them for subjective reasons. We choose the kind of theory to which we are already partial: we follow 'elegenace' or 'economy'

We have to live today by what truth we can get today and be ready tomorrow to call it falsehood.

Success or failure depends more upon attitude than upon capacity successful men act as though they have accomplished or are enjoying something. Soon it becomes a reality. Act, look, feel successful, conduct yourself accordingly, and you will be amazed at the positive results.

A winner's attitude: it may be difficult, but it's possible. A loser's attitude: It may be possible, but it's too difficult.

What a magnificent land and race is this Britain! Everything about them is of better quality than the corresponding thing in the U.S.... Yet I believe (or suspect) that ours is eventually the bigger destiny, if we can only succeed in living up to it.