The first object of my endeavours was the means to become perfect and happy.

Yeah, my dad bought me a guitar when I was like 10, and I didn't really want it then.

Proofs of the Euclidean [parallel] postulate can be developed to such an extent that apparently a mere trifle remains. But a careful analysis shows that in this seeming trifle lies the crux of the matter; usually it contains either the proposition that is being proved or a postulate equivalent to it.

My parents are private investigators for God's sake.

I bought some books in order to learn the first principles of philosophy.

I should almost therefore put forward the proposal that the third hypothsis (angle sum of a triangle less than two right angles) holds on the surface of an imaginary sphere.

I understood that the will could not be improved before the mind had been enlightened.