Our only business in the human form of life should be to revive our relationship with the Supreme Personality of Godhead and thus become qualified to return home, back to Godhead. Material happiness and distress come as soon as we accept a material body, regardless of what form. We cannot avoid such happiness and distress under any circumstances. The best use of human life, therefore, lies in reviving our relationship with the Supreme Lord, Vishnu.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhaagavatam 7.6.3, Purport

Deluded by the three modes [goodness, passion, and ignorance], the whole world does not know Me, who am above the modes and inexhaustible.
Lord Sri Krishna
Bhagavad-gita 7.13

The servants of Lord Chaitanya may not have much wealth, may not gather many followers, and may not have the academic qualification of being expert in argument and counter-argument, but ordinary people have no qualification to understand why they are indifferent to such matters. The devotees consider the service of Sri Chaitanya superior to wealth, followers, and knowledge. Therefore it is impossible for ordinary people to estimate their dignity, glories, and greatness.
Srila Bhaktisiddhanta Sarasvati Thakura
Commentary on Sri Chaitanya-bhagavata, Madhya-khanda 9.233

O Lord, is Your impersonal spiritual effulgence not always present everywhere? Even so, it has not been able to break even a single small leaf from the tree of repeated birth and death. On the other hand, the moment Your holy name is taken by the tongue it thoroughly shatters the tree of birth and death down to its roots. Of these two (the spiritual effulgence and the holy name), which should be served?
Srila Sridhara Swami
Sri Padyavali 28

The Lord’s form is always youthful. Every limb and every part of His body is properly formed, free from defect. His eyes and lips are pinkish like the rising sun. He is always prepared to give shelter to the surrendered soul, and anyone so fortunate as to look upon Him feels all satisfaction. The Lord is always worthy to be the master of the surrendered soul, for He is the ocean of mercy.
Sri Narada Muni
Srimad-Bhagavatam 4.8.46

O people, please hear of this treatment for the disease of birth and death! It is the name of Krishna. Recommended by Yajnavalkya and other expert yogis steeped in wisdom, this boundless, eternal inner light is the best medicine, for when drunk it bestows complete and final liberation. Just drink it!
King Kulashekhara
Mukunda-mala-stotra 15

Oh no! Just see my condition now! I must be the most sinful rogue of all! Alas, alas, what have I done, what have I done? The human form of life is very rare, but I have passed such a priceless life engaged simply as a slave in the service of the material energy.
Srila Bhaktivinoda Thakura
Kalyana Kalpataru 2.1.1