It is well also if they enable us to look upon our fellows, even the most eminent and respectable, with humor, and if they lead us to take ourselves not too seriously.

【翻译】假如那样能使我们用幽默的态度看待他人，即便是最优秀和最令人尊敬的人，而且，假如能让我们不把自己看得太重要，那也是很有好处的。

well用作表语形容词，一般指人的身体好，很少用来说明事物。本句换成good，更为普遍。