“We, on the contrary, make blessedness of life depend upon an untroubled mind, and exemption from all duties.”
Shortened Version: We think a happy life consists in tranquility of mind.
Book I, section 6
De Natura Deorum – On the Nature of the Gods (45 BC)
Original
Nos autem beatam vitam in animi securitate et in omnium vacatione munerum ponimus.
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Marcus Tullius Cicero 180
Roman philosopher and statesman -106–-43 BCRelated quotes

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Matthew Stewart, The Courtier and the Heretic (2006)
Context: 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."