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
The greatest inhibiting factor in practicing bhakti yoga is the doubting, cynical, intellectual mind. Doubt and skepticism harden the heart and narrow the mind.
—Gurudeva