We try to control things that we don't understand by worrying about them. If we consider every possibility, surely we will be prepared for any and all outcomes. We steel ourselves in advance, attempting to protect ourselves from having to flail about in uncertainty for even a moment, when whatever is going to happen happens. We have thought of it, and have a plan prepared...
And yet... no matter how much we worry, it always seems to be the one thing we have not considered that actually happens.... and somehow we end up surviving nonetheless.
I stop worrying and trust life to deliver me up exactly what I need.