The most rewarding part of life is definitely gaining awareness and the constant shift in your perspective.
Awareness of one’s self, as well as awareness of things around you, are a key part of life. Just knowing, understanding, and appreciating various aspects of life vastly improves the quality of your life.
The second related part of this concept is the in the ongoing development of the world and yourself which results in varied perspectives you have gained over the years. As you change, the world seems totally different than before.
I find this phenomenon of seeing things differently to be one of the most satisfying parts of life. The change in thought, attitude, and beliefs you have is serene. This gets me excited and motivated to constantly reinvent myself as well as continually question my existing notions of what I think is the right thought or way of doing things.
Imagine a rock and water flowing over it, under it, besides it, carrying it, and so many other ways water adapts. I never want a rock or challenge to keep me stuck in my ways, I want to flow around it with ease. Gaining awareness is that there may be rocks of different sizes along my path. Changing my perspective is realizing there will be many ways to flow over and around these various rocks.