WotLK Classic Holy Paladin Stat Priority

1. Intellect;
2. Spell Haste;
3. Mp5;
4. Spell Crit.

Intellect increases the size of your Mana pool, increases your spell crit chance, and, thanks to the talent Holy Guidance, grants spell damage and healing by 20% of your total Intellect. Intellect is an extremely powerful stat for Holy Paladins and fortunately you will not often have to choose between Intellect and the other stats listed here, as it is a primary stat.

Spell critical hits heal for 150% of what a normal cast would. The more Spell Crit rating you have, the more likely this is to occur, so this is basically free healing. It can, however, also lead to overhealing, which does nothing.

Mp5 (Mana Per 5 seconds) is Paladin's primary form of Mana regeneration.

Spell Haste makes your spell casts faster, allowing you to do more healing in a shorter timespan. The quicker cast speed can be extremely beneficial in high damage situations, but it will also make you drain your Mana even faster.