4 Things Cover All Knowledge

Since I understood four things, I have discarded all other knowledge.
First, that my daily sustenance has already been apportioned to me
and will neither increase nor decrease by my futile efforts, so I strive to increase it no more.
Second, I alone and no one else can atone from my sins, so I devote myself to the Lord.
Third, I know that I will never be able to escape death, which is in our pursuit, so I have prepared myself to meet him.
Fourth, I know that God is observing me; therefore I refrain from doing what I must not do.

-Hatim al-Asamm, "Kashf al-Mahjub"