Revising old knowledge or learning new?
The example of the one who seeks new knowledge be it from memorising more Surahs of the Quran or any other new knowledge whilst neglecting what he already has of knowledge by not revising it…
is like the one who finds diamonds in his path and puts them in his pocket but the pocket has a hole.
Would he acquire the diamonds in the end?
Likewise you won’t acquire beneficial knowledge if you don’t perfect and revise that which you have already learnt.