Ist Requirement of knowledge obligation stock his own life

Hazrat Maulana Ilyas Rahimullah said:

"The primary and most important requirement of
knowledge is this that a person should take stock of his own
life: he should think over his obligations and his omissions, and
should worry for fulfilling the rights which are due on him. On
the contrary, if a person instead uses his knowledge for taking
stock of others' deeds and for counting others' faults, it is but
the pride of knowledge- which is deadly harmful to the people
of knowledge."

Do your own work; don't pick holes in others' work.