There is only one real failure in life possible, and that is not to be true to the best one knows.Frederic Farrar
How can you be true to the best you know?
If you find yourself on this planet with a sacred duty, to not fulfill it would be your only, one true failure.
There is a reason why we are here. To say our existence is only chance and that we have no purpose, then you are not digging deep enough within yourself.
An apple tree that bears apples is achieving its purpose. It is in harmony with the universe. No matter how much the apple tree wishes to bear oranges, it will never be able to do it. It will either fulfill its purpose, or it will be barren.
To be true, to do that which you were designed for, is to be in harmony with yourself and the universe. The universe is a great symphony. All its parts working in unison, fulfilling the roles they were designed for. Good and evil, chaos and order, all in balance. We are a part of this symphony. We must play our parts.