the whole book is superb with 24 pieces of valueble advices
for this post, i'm quoting only one of the 24 advices, it is the sixth counsel:intention
My dear son...
How many nights have you remained awake seeking knowledge and reading books, forbidding yourself the pleasure of sleep! I do not know for what purpose [you did this].
If it was for attaining wordly benefits and securing its vanities, its status and position and asserting your supperiority over your peers and brothers, then woe to you and again woe;
but if your purpose was to revive the Shari'ah of the Prophet p.b.u.h and to train the character, and break the nafs al-ammara [the soul commanding to evil], then blessed are you and again blessed.
The poet spoke truely when he said,
"To spend the night awake and weeping for other than Allah is a foolish waste"