Every ant knows the formula of its ant-hill, every bee knows the formula of its beehive. They know it in their own way, not in our way. Only humankind does not know its own formula.
You can't possibly ask me to go without having some dinner. It's absurd. I never go without my dinner. No one ever does, except vegetarians and people like that.
There are subjects where reason cannot take us far and we have to accept things on faith. Faith then does not contradict reason but transcends it. Faith is a kind of sixth sense which works in cases which are without the purview of reason.