I would say that the quote from Illusions and the quote from Shakespeare essentially say the same thing.

The words you highlighted embody a philosophy in which the core idea is that life as we know it is an illusion...a projection of the spiritual self into the material realm, if you will. If life is an illusion, then there exists the possibility that we can manipulate it in ways that exceed the limits of physical laws, much like Neo in The Matrix.

But the real lesson to take from this perspective is that the essence of life, the "truth" of life, if you will, is almost never what we see. We see what we focus on, and therefore our perception is limited by what we can deduce about what we see.

In order to navigate the physical world, our brains construct an internal representation of what our senses tell us, and then it generates abstractions that help us understand and conceptualize the things in our surrounding environment.

Consider this cube:

Is the cube oriented down and to the right, or up and to the left?

This is just a simple example of what happens when we shift our focus. But this shifting of focus applies to all things in life, not just optical illusions. It applies to your relationships with others. It applies to your career. Ultimately, it applies to your happiness. It is what Wayne Dyer meant when he said, "If you change the way you look at things, the things you look at change."

Why is this important? Because there are two (or more) sides to everything. When someone tells you that they "have no choice," they have lost perspective. They have forgotten that life is just an illusion, a play, a mental construct, and that all they have to do to change their life is to change their mind.