以下是一些友情的英文格言：
1. “A friend is a second self.” - Jean Jacques Rousseau
2. “A true friend is the one who knows all about you and still loves you.” - Unknown
3. “Friendship is like a plant that grows only in sunlight.” - Eleanor Roosevelt
4. “A friend in need is a friend indeed.” - Chinese Proverb
5. “Friendship is not a matter of degrees, but of sincerity.” - Leo Buscaglia
6. “True friendship is like health - one should always value it, but never take for granted.” - Unknown
7. “Between two friends there is no need for ceremony.” - Chinese Proverb
請注意，這些格言可能因文化背景的不同而有所差異。