There is no scarcity for maintenance in the material world. Because of their poor fund of knowledge, the materialists are disturbed when there is an apparent increase of population on the earth. Whenever there is a living being on the earth, however, his subsistence is immediately arranged by the Lord. … If there is any scarcity in the world, it is the scarcity of God consciousness; otherwise, by the grace of the Lord, there is no scarcity of anything.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 3.5.5, Purport

For want of a taste of things spiritual, a grave doubt arises in the minds of those who are chained by worldly knowledge.
Srila Bhaktisiddhanta Sarasvati Thakura
Sri Brahma-samhita 5.24, Commentary

By surrendering to Him [the Lord] one can escape the embrace of illusion, just as a dreaming person forgets his own body. One who wants liberation from fear should constantly meditate upon Him, Lord Hari, who is always on the platform of perfection and thus never subject to material birth.
Sukadeva Goswami
Srimad-Bhagavatam 10.87.50

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

The forgetful conditioned soul is educated by Krishna through the Vedic literatures, the realized spiritual master and the Supersoul. Through these, he can understand the Supreme Personality of Godhead as He is, and he can understand that Lord Krishna is his eternal master and deliverer from the clutches of maya. In this way one can acquire real knowledge of his conditioned life and can come to understand how to attain liberation.
Sri Chaitanya Mahaprabhu
Sri Chaitanya-charitamrita, Madhya-lila 20.123

My dear Devi, although the Vedas recommend worship of demigods, the worship of Lord Vishnu is topmost. However, above the worship of Lord Vishnu is the rendering of service to Vaishnavas, who are related to Lord Vishnu.
Lord Shiva to Goddess Durga
Padma Purana

If even for a moment remembrance of Vasudeva [Krishna] is missed, that is the greatest loss, that is the greatest illusion, and that is the greatest anomaly.
Vishnu Purana