Knowing great figures or even the gods is not a big issue because there will be thousands of materials through multi media displaying the history, geography, qualities and characters of that figure. But the greatest challenge lies in knowing self, because no one knows other than oneself, nowhere we can find the information but by self observation.
Sadly, this is the most lacking part of wisdom in most men and women, because of which we see lots of chaos and disorders, as, instead of watching and observing self and ones moves in life, the people are busy focusing onto the external world, onto other's business.
Making habit of sitting quitely even for 5 minutes and watching self/physical/emotional and mental status could bring a tremendous changes in one's life as we then realize that the first fault lies in one's view upon the world, judgemental view.