You can never have understanding of any part of existence because all of existence is unlimited and your understanding is not.
You only ever have a relative insight into any aspect of life.
Life is eternal and infinite so at the best, you catch a sparkle of knowing or a shadow of understanding.
You cannot capture the whole thing because the whole understanding is the whole thing.
You cannot explain unlimited understanding because that is what gives you unlimited life.
You cannot sip the sea and explain it.
You cannot grasp at a cloud and then tell the world all about it.
You cannot watch a sunset and then explain eternity.
Be happy to be living within unlimited understanding but with full access to limited understanding whenever you desire.