Ludwig Wittgenstein said this quote

I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.

~ Ludwig Wittgenstein

Whereof one cannot speak, thereof one must be silent.

~ Ludwig Wittgenstein

The real question of life after death isn't whether or not it exists, but even if it does what problem this really solves.

~ Ludwig Wittgenstein

I am sitting with a philosopher in the garden; he says again and again 'I know that that’s a tree', pointing to a tree that is near us. Someone else arrives and hears this, and I tell him: 'This fellow isn’t insane. We are only doing philosophy.

~ Ludwig Wittgenstein