Know everything?

I am at a Ph.D. program which is supposed to be the highest level of education. Many people around me seem to expect me to know everything after earning degree. Actually, I can see some faculties and friends who seem to know everything. Brilliant folk. But I confess that as I study through, there comes up more things that I do not know. Even I am overwhelemed by the large amount of ignorance that I find. Let me be clear; Ph.D. is not a journey to learn everything but a journey to realize our ignorance in a field . At the end, I can confidently judge what I really know and do not know. I think that is all about Ph.D. education.