I read this great article recently by Gregg Krech about action and resolution. The mind will always, always throw up roadblocks. That's what it does. But the body? The body can just *get up* and go do something, taking the mind along for the ride.
Right? Think of the middle of the night. You wake up and have to go to the bathroom. Your strange sleep-mind pitches all kinds of scenarios and alternatives, but eventually you realize that it's all madness; you *have* to get up. When you get back to bed, a few minutes later, your mind realizes it really wasn't worth all that creative effort.
Life is like that. We don't have to know how or why. Our body knows. That's enough.
Thankfully, it's more than enough.