I have four kinds of days
(1) A day when I go out and meet someone more
knowledgeable than me, so I learn from him,
and that is the day of my benefit and profit.
(2) A day when I go out and meet someone less
knowledgeable than me, so I teach him,
and that the day of my reward.
(3) A day when I go out and meet someone like
me and I study and review with him, and that
is the day of my lesson.
(4) A day when I go out and meet someone below
my level but he sees himself as being above my
level, so I don't talk to him, and I make that
the day for my rest."
- Ibraaheem An-Nakha'ee
(Jaami'u Bayaan Al-'Ilm no. 878)
