Truly, all the lively, the lively men from the school of Kant, became Neospinozists! In other words, they became Spinozists. The Kantians became Spin… - Benedictus de Spinoza

...Yes, you must read Spinoza. Those who accuse him of atheism are asses. Goethe said, 'When I am upset or troubled I reread the Ethics.' Perhaps like Goethe you will find calm in the reading of this great book. Ten years ago I lost the friend I had loved more than any other, Alfred Le Poittevin. Fatally ill, he spent his last nights reading Spinoza. [Original in French: A propos de Spinoza (un fort grand homme, celui-là), tâchez de vous procurer sa biographie par Boulainvilliers. Elle est dans l'édition latine de Leipsick. Emile Saisset a traduit, je crois, l'Éthique. Il faut lire cela. L'article de Mme Coignet, dans la Revue de Paris était bien insuffisant. Oui, il faut lire Spinoza. Les gens qui l'accusent d'athéisme sont des ânes. Goethe disait: « Quand je me sens troublé, je relis l'Éthique ». Il vous arrivera peut-être, comme à Goethe, d'être calmée par cette grande lecture. J'ai perdu, il y a dix ans, l'homme que j'ai le plus aimé au monde, Alfred Le Poittevin. Dans sa maladie dernière, il passait ses nuits à lire Spinoza.]

The movement of modern philosophy is back towards the position of the old Ionian philosophers, but strengthened and clarified by sound scientific ideas. If I publish my criticism on Comte, I should have to re-write it as a summary of philosophical ideas from the earliest times. The thread of philosophical development is not on the lines usually laid down for it. It goes from Democritus and the rest to the Epicureans, and then the Stoics, who tried to reconcile it with popular theological ideas, just as was done by the Christian Fathers. In the Middle Ages it was entirely lost under the theological theories of the time; but reappeared with Spinoza, who, however, muddled it up with a lot of metaphysics which made him almost unintelligible.

Like Socrates, Spinoza avers that blessedness comes only from a certain kind of knowledge—specifically, the "knowledge of the union that the mind has with the whole of Nature."
...the life of contemplation is also a life within a certain type of community—specifically, a fellowship of the mind. Like Socrates with his circle of debating partners, or Epicurus in his garden with his intellectual companions, Spinoza imagines a philosophical future... upon achieving blessedness for himself, he announces in his first treatise, his first step is "to form a society... so that as many as possible may attain it as easily and as surely as possible." For, "the highest good," he claims, is to achieve salvation together with other individuals "if possible."