Philosophy's error is to be too endurable.

A single overstatement, wherever or however it occurs, diminishes the whole, and a carefree superlative has the power to destroy, for the reader, the object of the writer's enthusiasm.

If there is a single initial error at the root of all the difficulties philosophy is involved in, it can only be the one Descartes committed when he decreed, a priori, that the method of one of the sciences of reality was valid for the whole of reality.

What philosophy has lacked most of all is precision.

Generally speaking, the errors in religion are dangerous; those in philosophy only ridiculous.

Philosophy of fault is the greatest fault. At the sight of evil, the mind is immediately polluted.

The invalid assumption that correlation implies cause is probably among the two or three most serious and common errors of human reasoning.

The chief danger to philosophy is narrowness in the selection of evidence.

[The] habit of totalling pains and pleasures across individuals is one of the main errors in ethics today.

It is the most foolish of all errors for young people of good intelligence to imagine that they will forfeit their originality if they acknowledge truth already acknowledged by others.

There are all kinds of sources of our knowledge; but none has authority ... The fundamental mistake made by the philosophical theory of the ultimate sources of our knowledge is that it does not distinguish clearly enough between questions of origin and questions of validity.

Every virtue that reaches the exaggeration, is becoming a defect

To overvalue something is a form of lying.

The error in positivism is that it takes as its standard of truth the contingently given division of labor, that between the science and social praxis as well as that within science itself, and allows no theory that could reveal the division of labor to be itself derivative and mediated and thus strip it of its false authority.