It all depends on how you want to build. If you want a pure holy priest, the best things to max are Light Heal, Guardian's Protection, Angel's Blessing, and Circle of Power. Pure in Heart and Resurrection can be left with 1 point only. If you want to do a little damage as well, you can put 1 point on your Blood side abilities as well. Priests are good for Holy builds as they are needed for mostly anything in the game, ie Vault duo's, etc. You can even solo dungeons quite early with a build like this as well. Priests REALLY come in handy after you rebirth, and your rebirth ability gives an aura for buffing intelligence stats for characters in a certain area of yourself. Good luck and hope you enjoy playing here!