Full Idea
In life it is before all things useful to perfect the understanding, or reason, as far as we can, and in this alone man's highest happiness or blessedness consists.
Gist of Idea
Man's highest happiness consists of perfecting his understanding, or reason
Source
Baruch de Spinoza (The Ethics [1675], IVApp 04)
Book Reference
Spinoza,Benedict de: 'Ethics, Improvement of Understanding, Letters', ed/tr. Elwes,R [Dover 1955], p.237
A Reaction
I fear that only a highly intelligent person like Spinoza would suggest this. The genius of Jesus is to say that if you don't have a powerful intellect you can still be happy by having a pure and loving heart. The Spinoza route is better, if possible.