When I come upon anything-in Logic or in any other hard subject-that entirely puzzles me, I find it a capital plan to talk it over, aloud, even when I am all alone. One can explain things so clearly to one's self! And then, you know, one is so patient with one's self: one never gets irritated at one's own stupidity!
Someone said: "I have been prejudiced against myself from my earliest childhood: hence I find some truth in all blame and some stupidity in all praise. I generally estimate praise too poorly and blame too highly.