Suppose cats became philosophers, they would see a cat universe and have a cat solution of the problem of the universe, and a cat ruling it. So we see from this that our explanation of the universe is not the whole of the solution.
Cogito cogito ergo cogito sum -- "I think that I think, therefore I think that I am;" as close an approach to certainty as any philosopher has yet made.
Sed nescio quo modo nihil tam absurde dici potest quod non dicatur ab aliquo philosphorum. (There is nothing so absurd but some philosopher has said it.)