Rajesh Setty wrote an excellent post today titled, "In Search of Certainty". He clearly explains for each of us how uncertainty is context dependent.
Embracing uncertainity is dependent on our willingness and determination to be creative. There is also an awareness component to it. Some people feel at ease to embrace technical/analytical uncertainity but others might be at ease external world. Generally, former is the case with young people and the later with experienced professionals and it has to do with resources. Being aware of internal/external resources will help us leverage them to embrace uncertainty.