The Supreme Personality of Godhead is unlimited, and any service rendered Him is also unlimited because the Lord’s unlimited energy is the dynamic force behind such service. When this supernatural energy is reposed in us, all our thoughts and feelings, our physical body, our mind, our knowledge, and so on, are energized by it. Every endeavor then simply merges into this flow of energy, and we become like a lotus growing from the mud – in the world but uncontaminated by it. This is how the nondual principle comes alive: our mind, heart, consciousness, and activities become nondifferent from the Supreme Lord, the Absolute Truth.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Renunciation Through Wisdom, Chapter 5

When a diseased eye is treated with medicinal ointment it gradually recovers its power to see. Similarly, as a conscious living entity cleanses himself of material contamination by hearing and chanting the pious narrations of My glories, he regains his ability to see Me, the Absolute Truth, in My subtle spiritual form.
Lord Sri Krishna
Srimad-Bhagavatam 11.14.26

Foolish people, who are actually drowning in ignorance but consider themselves intelligent and scholarly, get battered by the kicks of maya. They wander in the material world just like blind people being led by other blind people.
Mundaka Upanishad 1.2.8

All the bodily forms of the Supreme Soul are eternal and unchanging. They have no material qualities, desirable or undesirable, and at no time are they born from material nature. They are all full of supreme bliss, fully aware of everything, complete in all transcendental qualities, and devoid of all faults.
Maha-varaha Purana
Quoted in Jiva Goswami’s Bhagavat-sandarbha, Anuccheda 54

The Supreme Personality of Godhead may have inconceivable potencies and mutually contradictory qualities, for these truths are all described in the scriptures, which are the root of all knowledge of the spiritual reality.
Srila Vyasadeva
Vedanta-sutra 2.1.27

It is true that by practicing restraint of the senses by the yoga system one can get relief from the disturbances of desire and lust, but this is not sufficient to give satisfaction to the soul, for this [satisfaction] is derived from devotional service to the Personality of Godhead.
Sri Narada Muni
Srimad-Bhagavatam 1.6.35

Although the Supreme Person has all variety of His personal energies, if one’s mind is unable to appreciate that variety one may conceive of the Lord in a more general way, or one may even have some direct realization of Him but without a clear distinction between the energies and their possessor. Considered in this way, He is known as Brahman.
Srila Jiva Goswami
Sri Bhagavat-sandarbha, Anuccheda 2