Predestination is the idea that God chooses who goes to Heaven and who goes to Hell regardless of any human merit, effort or virtue. Calvinism teaches that God must regenerate an individual before she is converted. In other words, before a person can desire to come to Christ and thus truly be saved, her desires must be changed first. And desiring God itself is a gift from God. For a person to really want Christ in their heart, their heart must first be changed to want Christ. (Confused yet?)