If your bread fell out of heaven, you might be afraid to make a diet of it. Sure, it's convenient, but most people need to sink their teeth into something of this coarse world.
That's also the way many people feel about any topic that touches on the spiritual. It is the unknowableness of it, that you can't grasp it in your hand or tally it up with your assets that causes people to shun it, to run from it, to even deny it exists.
These people are running from who they are, for we are spiritual beings in essence, far more than we are a body with a bank account. Without spiritual nourishment we are plagued by insatiable cravings, like a body lacking essential vitamins
For the human being, inner peace is only achieved by first surrendering to the unknown.
