If it works, it's true.
To study the abnormal is the best way of understanding the normal.
Our ideas must agree with realities, be such realities concrete or abstract
Any object not interesting in itself may become interesting through becoming associated with an object in which an interest already exists.
We have to live today by what truth we can get today and be ready tomorrow to call it falsehood.
How many of us persist in a precipitate course which, but for a moment of heedlessness we might never have entered upon, simply because we hate to change our minds.