The need of the spirit soul is that he wants to get out of the limited sphere of material bondage and fulfill his desire for complete freedom. He wants to get out of the covered walls of the greater universe. He wants to see the free light and the spirit. That complete freedom is achieved when he meets the complete spirit, the Personality of Godhead.

His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 1.2.8, Purport

The holy name of the Lord is never revealed to one who is situated in the bodily concept of life and thinks in terms of "I" and "mine." If one doesn't reject the enjoying mentality, the transcendental platform will never be attained.

Srila Bhaktisiddhanta Sarasvati Thakura
Prakrta-rasa Sata-dusini

If you become conscious of Me, you will pass over all the obstacles of conditioned life by My grace. If, however, you do not work in such consciousness but act through false ego, not hearing Me, you will be lost.

Lord Sri Krsna
Bhagavad-gita 18.58

One who daily sings the glories of Yasoda's son [Krsna], which are as cooling as sandalwood and camphor, is not troubled by the days of the Kali-yuga, for at every step he experiences a torrential flood of the sweetest nectar.

Sri Kaviratna
Padyavali 41

The Supreme Personality of Godhead is the only shelter of everyone. Anyone desiring to be protected by others is certainly a great fool who desires to cross the sea by holding the tail of a dog.

Srimad-Bhagavatam 6.9.22

This body, which is eatable by jackals and dogs after death, does not actually do any good for me, the spirit soul. It is usable only for a short time and may perish at any moment. The body and its possessions, its riches and relatives, must all be engaged for the benefit of others, or else they will be sources of tribulation and misery.

Sage Dadhici
Srimad-Bhagavatam 6.10.10

The Supreme Soul dwells within the core of all living beings, but He does not manifest Himself to everyone. Only persons of superior intelligence and purified vision may perceive Him.

Sri Yamaraja
Katha Upanisad 3.12

Upon achieving the stage of transcendental devotional service in pure love of God, a person becomes perfect, immortal, and peaceful.

Sri Narada Muni
Narada-bhakti-sutra 4