Wisdom gives you an experience bonus when killing creatures or solving quests, so you level up slightly faster. Also killing things gives more experience at lower levels, while solving quests gives more at high levels. Most people do not get too much higher than that, maybe 51/52 by completing all quests, killing all hostile creatures and strategic use of the wishing well and the golden jug in the bee/wasp world to go up a level (the longer you wait, the more of an experience bonus this works out to).
