You have willingly given yourself to the service of a good deity or cause, denying yourself an ordinary life to better serve your highest ideals.
Benefit: You gain a +2 perfection bonus on Diplomacy checks.
Special: This feat serves as the prerequisite for several other feats, including the Vow of Abstinence, Vow of Chastity, Vow of Non-Violence, Vow of Obedience, Vow of Peace, Vow of Poverty and Vow of Purity.
Source: Book of Exalted Deeds (Page 45)