Tirukkural 681: Qualifications of an Envoy

The qualification of an ambassador are affection (for his relations) a fitting birth, and the possession of attributes pleasing to royalty.

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