Take the ideas of the masses (scattered and unsystematic ideas) and concentrate them (through study turn them into concentrated and systematic ideas), then go to the masses and propagate and explain these ideas until the masses embrace them as their own, hold fast to them and translate them into action, and test the correctness of these ideas in such action. Then once again concentrate ideas from the masses and once again go to the masses so that the ideas are persevered in and carried through. And so on, over and over again in an endless spiral, with the ideas becoming more correct, more vital and richer each time. Such is the Marxist theory of knowledge.
— Mao Zedong

If we focus on the minuses, we go down the spiral. But if we are able to focus on the pluses, we can become stronger and put more meaning into our life.
Petra Nemcova spiral quote

The human mind always makes progress, but it is a progress in spirals.
— Madame de Stael

A circle is the reflection of eternity. It has no beginning and it has no end - and if you put several circles over each other, then you get a spiral.
— Maynard James Keenan

Modern man must descend the spiral of his own absurdity to the lowest point; only then can he look beyond it. It is obviously impossible to get around it, jump over it, or simply avoid it.
— spiral quotation by Vaclav Havel