Devotee means he is able to tolerate all kinds of discomfort and whims of the material nature, and because he is so much absorbed in serving Krishna, he takes no time to become angry or take offense with others or find out some fault, no. Devotee means very liberal and kind to everyone, always gentleman under all kinds of conditions of life.

From Srila Prabhupada's Letter to Hansadutta  —  Ahmedabad 10 December, 1972.