In the strictest sense, we cannot actually think about life and reality at all, because this would have to include thinking about thinking, thinking about thinking about thinking, and so ad infinitum. One can only attempt a rational, descriptive philosophy of the universe on the assumption that one is totally separate from it. But if you and your thoughts are part of this universe, you cannot stand outside them to describe them. This is why all philosophical and theological systems must ultimately fall apart. To “know” reality you cannot stand outside it and define it; you must enter into it, be it, and feel it.
Recommended reading: The Wisdom of Insecurity.