Every biology textbook I've ever read tells us the purpose of life in plain black and white: to reproduce. If you have children, especially a lot of children, you will see the purpose of life.

This assertion relies a bit much on overloading the definition of “life”, and I for one care more about spreading my ideas than my genes.

Why?

Can’t say; this set of genes didn’t produce a consciousness that cares to pass them along, I suppose