An investor will succeed by coupling good business judgment with an ability to insulate his thoughts and behavior from the super-contagious emotions that swirl about the marketplace.
As human beings we have the same experience of destructive and constructive emotions. We also have a human mind capable of developing wisdom. We all have the same Buddha nature.
Spirituality is a natural part of ourselves, as natural as emotions, but we've got all the language wrong and made this divide between secularism and spirituality, whereas instead it's about being human.