Actually the revelation that Siddhartha had is that the natural state of humanity is suffering. People grow old and die, they gain things and lose things and it is the sadness and sufferering caused by the inevitable loss of things that defines humanity. The way to step outside this cycle of suffering and reach enlightenment according to Buddhist teaching is to accept that everything in the physical world is just a temporary and to appreciate things for what they are, when they are and to be content.

The idea of of human desire and its role in the nature of humanity is touched upon in Buddhism, when Siddhartha turns to aestheticism in his search for enlightenment, but in the end he comes to the conclusion that desire is a natural part of the world and is not inherently evil, such as the desire to eat when you are hungry or the desire to love and be loved, hence why he abandoned aestheticism and continued on his journey.

Please have the facts straight on something if you are going to try to use it as a point of reference.