In the mundane field [the] outlook of doing good to others in the form of society, community, family, country, or humanity is a partial manifestation of the same original feeling in which a pure living entity feels happiness by the happiness of the Supreme Lord.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Even though one may have gone to the other side of all the Vedas, and even though one is well versed in all the revealed scriptures, if one is not a devotee of the Supreme Lord, he must be considered the lowest of mankind.
Garuda Purana (Quoted in Srimad-Bhagavatam 2.9.36, Purport)
Although maya [illusion] is false or temporary, the background of maya is the supreme magician, the Personality of Godhead, who is Mahesvara, the supreme controller.
Svetasvatara Upanisad 4.10
The devotees of the Lord never annihilate their individual existences even after the dissolution of the entire cosmic manifestation. The Lord and the devotees who associate with Him are always eternal, in both the material and spiritual worlds.
Skanda Purana, Kasi-khanda
(Quoted in Srimad-Bhagavatam 3.7.37, Purport)
Just as the illumination of a fire, which is situated in one place, is spread all over, the energies of the Supreme Personality of Godhead, Parabrahman, are spread all over the universe.
Visnu Purana 1.22.53
Let me take shelter of Him whose incarnations and qualities and activities are mysterious imitations of worldly affairs. One who invokes His transcendental names, even unconsciously, at the time he quits this life, is certainly washed immediately of the sins of many, many births and attains Him without fail.
The sun is naturally warm, the moon naturally cool, the earth naturally tolerant, the wind naturally restless, the saints naturally grave, and the ocean naturally deep. Similarly, Krsna is naturally controlled by love.
Srila Krsnadasa Kaviraja Gosvami
Pure devotional service in Krsna consciousness cannot be had even by pious activity in hundreds and thousands of lives. It can be obtained only by paying one price that is intense greed to obtain it. If it is available somewhere, one must purchase it without delay.
Srila Rupa Gosvami, Padyavali