Slow to Learn, Slow to Forget

I am slow to learn and slow to forget that which I have learned...
My mind is like a piece of steel — very hard to scratch anything on it, and almost impossible after you get it there to rub it out.

Abraham Lincoln

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There are four types of students:
Quick to grasp and quick to forget — his advantage is cancelled by his disadvantage;
hard to grasp and hard to forget — his disadvantage is cancelled by his advantage;
quick to grasp and hard to forget — this is a good portion;
hard to grasp and quick to forget — this is a bad portion.

Mishna; Avot 5:12