A friend is a second self.

朋友是另一个我。

A friend is best found in adversity.

患难见真友。

A friend is never known till a man has need.

不到患难时，永远不能认识真正的朋友。

A friend is not so soon gotten as lost.

交友慢，失友快。

A good friend is the one who accompanies you to wait for the dawn in the darkest time.

好朋友就是最黑暗的时候，陪你一起等天亮的人。

Friendship is the shadow that follows you near.

友谊如同影随形。

Like aged wine, friendship grows more precious with time, its depth remaining unaltered despite the passing years.

友谊如同陈年佳酿，随着时间的推移愈发珍贵，其深度岁月无法改变。

Walking with a friend in the dark is better than walking alone in the light.

在黑暗中与朋友并肩同行好过在光亮中独自行走。

Friends are the siblings God never gave us.

朋友如手足。

这些独白和句子都表达了友谊的珍贵和深刻，适合用来描述朋友之间的深厚情感和相互支持。