Tirukkural 374: Acquisition of Wealth and Knowledge

There are (through fate) two different natures in the world, hence the difference (observable in men) in (their acquisition of) wealth, and in their attainment of knowledge.

Image of Satguru Sivaya Subramuniyaswami
A satguru is needed because the mind is so cunning and the ego is a self-perpetuating mechanism. It is he who inspires, assists, guides and impels the shishya toward the Self of himself.
—Gurudeva