Problem (n.) is the wrong word for philosophical troubles: so long as they are seen as problems they are tantalizing and look insoluble.
Problem (n.) are solved only by changing one's point of view; unwilling to change, one should call them unsolvable.
A Problem (n.) exists only where there is a method of solution; where only revelation could answer, there is no question.
A Problem (n.) can be barricaded, walled in by wrong expressions thrown up generation after generation, until it is almost unreachable.
A Problem (n.) is whatever one can tackle, and only where a problem can exist can something be asserted.
Problem (n.) are misunderstandings, removed by clarifying the rules by which we are inclined to use words.
A Problem (n.) like 25 × 16 and one in integration differ not in difficulty but in sense: which calculus can solve it.
A Problem (n.) arises from the pressure of a tension that concentrates into a question and becomes objective.
A Problem (n.) that is serious has uncertainty reaching to its very roots, so one must be ready to learn something wholly new.