Ordo et connexio idearum idem est ac ordo et connexio rerum - Benedictus de Spinoza

The perfection of a thing does not annul its existence, but, on the contrary, asserts it. Imperfection, on the other hand, does annul it ; therefore we cannot be more certain of the existence of anything, than of the existence of a being absolutely infinite or perfect—that is, of God. For inasmuch as his essence excludes all imperfection, and involves absolute perfection, all cause for doubt concerning his existence is done away, and the utmost certainty on the question is given. This, I think, will be evident to every moderately attentive reader.

...So when you play five notes, if each note had a big ego it would want to be louder than the note before. And therefore I learned from this very simple fact, that no matter how great an individual you are, music teaches you that the creativity only work in groups, and the expression of the group is very often larger than the sum of the parts. And you can draw whatever conclusions you want from this, but I think that this is a not unimportant factor. And maybe in a strange way I've found some answers to all this, not in music but in philosophy, especially from reading regularly and for many years the Ethics of Spinoza. Spinoza was a religious scholar, a political architect, a philosopher, who aspired to geometric demonstration of the universe and the human being in it, and he was a biological thinker who advanced the science of emotion. And there lies of course one of the great difficulties of making music, the science of emotion.

Schelling calls Spinoza "the first philosopher who found the concepts whereby all the following centuries have grasped and fixed the two extremities of our knowing mind." For Lessing and Herder philosophy and Spinozism were identical; and the same statement was also made by Hegel, the most comprehensive and systematic, as well as the most independent and firm, among the German philosophers, who did not attempt, like Leibnitz, Fichte or Schelling, to reshape again and again his original-philosophy. And Hegel also said, "either you have Spinozism or you have no philosophy!"