Though the exact words and strictures of the Oath of Devotion vary, paladins of this oath share these tenets.
Honesty
Don't lie or cheat. Let your word be your promise.
Courage
Never fear to act, though caution is wise.
Compassion
Aid others, protect the weak, and punish those who threaten them. Show mercy to your foes, but temper it with wisdom.
Honor
Treat others with fairness, and let your honorable deeds be an example to them. Do as much good as possible while causing the least amount of harm.
Duty
Be responsible for your actions and their consequences, protect those entrusted to your care, and obey those who have just authority over you.