When a person becomes a true Christian, they have been changed at the deepest level; in particular, they've been changed down to the level of their appetites and desires. The world and many professing Christians hunger after many different things, but very few people hunger and thirst after righteousness. Very few people feel a longing ache in their souls that can only be relieved by conformity to God's will and the image of Christ. Do you hunger and thirst after righteousness?