Divine Plea is one of a Holy Paladins two main sources of mana regen (along with illumination). The spell is on a one minute cool down and returns 25% of your total (maximum) mana over 15 seconds while reducing healing done by 20%. Because the spell is based off total mana, it scales with intellect, and raid buffs (Mark, Kings and AI).

Note, when considering to stack Int, remember that each point also gives a small amount of spell crit and spell power (which is not considered here).

Int Mana DP MP5 (60s CD) MP5 (90s CD)
1500 28510 7127 594 396
1400 26785 6696 558 372
1300 25060 6265 522 348
1200 23335 5834 486 324
1100 21610 5402 450 300
1000 19885 4971 414 276
900 18160 4540 378 252
800 16435 4109 342 228
700 14710 3677 306 204

Returns on Divine Plea by character intellect

Per Int Mana DP MP5 (60s CD) MP5 (90s CD)
1 17.25 4.31 0.36 0.24
3 51.75 12.94 1.08 0.72
10 172.50 43.12 3.59 2.40
20 345.00 86.25 7.19 4.79
30 517.50 129.38 10.78 7.19
50 862.50 215.62 17.97 11.98

Returns on Divine Plea per point on intellect

Notes

Total mana from character intellect = 4394 + (15 * (Intellect – 102) * 1.15)

4394 is the base mana, and 102 is the base intellect of a level 80 Paladin. Intellect after the base amount gives 15 mana per point, then multiplied by 15% from holy talents.