"The mind is it's own place, and in itself can make a heaven of Hell, or a hell of Heaven" ~ John Milton
We can attain a level of knowledge about ourselves which acknowledges the power of the brain.
We can then understand it's capacity to interpret our conditions in ways which confirm our own view of the world, and our own view of ourselves (Lucky me vs. poor ol' me, listen to my woes). We can then understand that such thoughts either promote or detract from improved future outcomes for ourselves or others. Then and only then will our plans, goals and aspirations be such that the progress we make and the way we make it becomes sustainable and repeatable.