If a grown man were put into such a condition as the child within the abdomen, completely entangled in all respects, it would be impossible for him to live even for a few seconds. Unfortunately, we forget all these sufferings and try to be happy in this life, not caring for the liberation of the soul from the entanglement of birth and death. It is an unfortunate civilization in which these matters are not plainly discussed to make people understand the precarious condition of material existence.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 3.31.8, Purport

The service of Truth is the function of the soul.
Srila Bhaktisiddhanta Sarasvati Thakura
Search for Truth (essay)

A devotee advanced on the spiritual platform sees everything movable and inert as the Supreme Lord. For him, everything he sees here and there is but a manifestation of Lord Krishna.
Sri Chaitanya Mahaprabhu
Sri Chaitanya-charitamrita, Madhya-lila 8.273

What learned person would approach anyone but You [Krishna] for shelter, when You are the affectionate, grateful, and truthful well-wisher of Your devotees? To those who worship You in sincere friendship You reward everything they desire, even Your own self, yet You never increase or diminish.
Sri Akrura
Srimad-Bhagavatam 10.48.26

For one who is meditating on sense gratification, material life, although lacking factual existence, does not go away, just as the unpleasant experiences of a dream do not.
Lord Sri Krishna
Srimad-Bhagavatam 11.22.56

[On hearing from the Vedic scriptures,] some may take the union of soul and Supersoul literally, but their understand is wrong. After all, one distinct thing never changes into another separate thing.
Vishnu Purana 2.14.27

Pure devotional service in Krishna consciousness is the highest enlightenment, and when such enlightenment is there, it is just like a blazing forest fire, killing all the inauspicious snakes of desire.
Padma Purana
Quoted in The Nectar of Devotion, Chapter 1

O Lord, I do not pray for heavenly happiness. I do not even aspire for liberation. Simply let the nectar of Krishna’s transcendental pastimes flood my ears, day after day.
Sri Kaviratna
Srila Rupa Goswami’s Padyavali, Verse 40

After souls evolve upward through their various paths of development, they eventually will attain devotion to Krishna in the end. Even though they aspire for the incomplete goals of various religious paths, devotion to Krishna is always available to them, because the perception of the truth of Krishna is the ultimate knowledge inherent within every living entity.
Srila Bhaktivinoda Thakura
Vaishnava-siddhanta-mala, Chapter 2