“The gang serves lies, the passionate
Man plays his part; the cold passion for truth
Hunts in no pack.”

Religio Laici (1682), Preface.

As reported by Alexander Polyhistor, and Diogenes Laërtius in Lives and Opinions of Eminent Philosophers, "Pythagoras", Sect. 30, in the translation of C. D. Yonge (1853)

Source: Making Friends with Candy

http://www.entrepreneur.com/article/234222.

Source: The Darkness That Comes Before

Collected Plays (1958) Introduction, Section 7
Context: By whatever means it is accomplished, the prime business of a play is to arouse the passions of its audience so that by the route of passion may be opened up new relationships between a man and men, and between men and Man. Drama is akin to the other inventions of man in that it ought to help us to know more, and not merely to spend our feelings.

Not found in Beethoven's known works. It may be a summary of the following description of Beethoven from his piano pupil Ferdinand Ries: "When I left out something in a passage, a note or a skip, which in many cases he wished to have specially emphasized, or struck a wrong key, he seldom said anything; yet when I was at fault with regard to the expression, the crescendo or matters of that kind, or in the character of the piece, he would grow angry. Mistakes of the other kind, he said were due to chance; but these last resulted from want of knowledge, feeling or attention. He himself often made mistakes of the first kind, even playing in public."
Disputed
Variant: To play a wrong note is insignificant; to play without passion is inexcusable

Source: The Life of Poetry (1949), p. 126

Not found in Beethoven's known works. It may be a summary of the following description of Beethoven from his piano pupil Ferdinand Ries: "When I left out something in a passage, a note or a skip, which in many cases he wished to have specially emphasized, or struck a wrong key, he seldom said anything; yet when I was at fault with regard to the expression, the crescendo or matters of that kind, or in the character of the piece, he would grow angry. Mistakes of the other kind, he said were due to chance; but these last resulted from want of knowledge, feeling or attention. He himself often made mistakes of the first kind, even playing in public."
Disputed
Source: "When Beethoven gave me a lesson" https://books.google.com/books?id=j8RIq67v51cC&pg=PA294&dq=%22when+beethoven+gave+me+a+lesson%22&hl=en&sa=X&ved=0CBwQ6AEwAGoVChMI7Yyz0PiNyQIViDuICh1YIAzR#v=onepage&q=%22when%20beethoven%20gave%20me%20a%20lesson%22&f=false