From Self-Development and the Way to Power, by L. W. Rogers (5)

Why do people suffer from poverty and disease? Only because of our
blundering ignorance that makes their existence possible for us, and
because we do not comprehend their meaning and their lessons, nor know
the attitude to assume toward them. Had we but the wisdom to
understand why they come to people, why they are necessary factors in
their evolution, they would trouble us no longer. When nature's lesson
is fully learned these mute teachers will vanish.

And so it is with all forms of suffering we experience. They are at
once reactions from our ignorant blunderings and instructors that
point out the better way. When we have comprehended the lessons they
teach they are no longer necessary and disappear.