Why is the Torah compared to a fig tree? The fruit of most trees - the olive tree, the vine, and the palm tree - is collected all at once, while that of the fig tree is collected a bit at a time. So, too, regarding the Torah. Today a person learns a little, and tomorrow she shall learn much, for the Torah cannot be learned in a single year or two.
(Babylonian Talmud 53b)

Oh, and did you know that the Torah is compared to a fig, too!
Because every fruit has in it something inedible: dates have pits, grapes have seeds, pomegranates have skin. But every part of the fig is good to eat.
(Yalkut Shimoni Joshua 1)