Our two cats always try to run out the door with us whenever we leave the house. With their limited brain size, however, they cannot possibly comprehend what we are doing out there and why we are doing it.
We have a few billion more brain cells than our cats do, but our brains are still limited in size. Cosidering the vastness of the Multiverse in comparison to the biological limits of our own intelligence, it is not only possible, but indeed highly likely, that we are just not smart enough to understand many of the things that go on there, no matter how much we would like to do so. But that won't keep us from trying, any more than we can keep our cats from trying to follow us when we leave the house in the morning to see where we go.
If the Multiverse is conscious, as some physicists now believe, then we have a scientific explanation for concepts such as those expressed in Schopenhauer's "The World as Will and Idea," or in Claude Bristol's "The Magic of Believing," as expressed below:
Can we really command the Multiverse, as Schopenhauer and Bristol are saying, or are we just believing in our goal so intensely that it gives us the confidence to persist against all odds until success is finally achieved? As the Greek philosopher Seneca observed, "It is not because things are difficult that we do not dare, but it is because we do not dare that things are difficult."
All I can say is that I have used this book since my adolescence as a guide for challenges great and small. Despite my rigorous training as an experimental psychologist, I remain firmly convinced that if you can believe in a goal deeply enough that your motives are free from conflict, you can believe it. And if you can believe it, you can make it happen!