न च तस्मान्मनुष्येषु कश्चिन्मे प्रियकृत्तमः ।
भविता न च मे तस्मादन्यः प्रियतरो भुवि ॥ १८.६९ ॥

na ca tasmān-manuṣyeṣu kaścin-me priya-kṛttama: |
bhavitā na ca me tasmād-anya: priya-taro bhuvi || 18.69 ||

Krishna says something more to show how great is the pedestal of such a one, who is committed to the exposition of the great message of Bhagavad Gita:

Therefore, among the humans, there is none who loves the Supreme better than him (the exponent of this gospel). Nor shall there be anyone on the earth dearer to the Supreme than him.

Among all the humans, none will be dearer to the Supreme than such a rare, excellent Knower-exponent, who is able to reveal the spiritual wisdom of the dialogue to the listeners. The Soul-gospel will remain hidden or unknown, unless it is brought to light by one who has realized it - its worth and utility. If and when a seeker is able to pursue the teachings and realize the supreme Truth, the only real task before him is to expose it with irresistible fondness to humanity, helping as many people as possible to have a redeeming touch of the Soul.

Such a mission of dissemination is invaluable by all standards. Its worth and elegance are infinitely more than any kind of material wealth or bequest. One to bequeath such an inestimable treasure, must first possess it in abundance. The exposition of Bhagavad Gita has verily to be done by Knowers and Seers.

Krishna says there is none greater than such an exponent, who devotes his life for the mission of imparting spiritual message, especially of Bhagavad Gita. Nor one greater will ever be born. This means the highest task and mission for a pious, noble, righteous person is to imbibe the spiritual wisdom and dedicate himself wholesomely to its dissemination.