It is possible for us to establish for ourselves through inference that the Buddha was in possession of an extremely high level of wisdom, an extremely high level of awareness, different from an ordinary person. For example, if we have a bowl of water and just look at it with our naked eye we are not able to see all of the small life forms that exist within it, nor are we necessarily able to know about these life forms through a process of inference. However, the Buddha, through his extremely high level of perception, is able to know about the existence of these life forms; the Buddha already described the existence of all kinds of microscopic organisms in the body. He even gave names for the different kinds of organisms that live in the lungs, the heart and various other organs. At that time there were no x-ray machines or other means to see such things, but the Buddha established their existence through his sublime wisdom.
Depicted from "Buddhism in the 21st Century - Part 22" June, Sydney, Australia