The gross material body is based on the conditions of the subtle mind, and the senses are created according to the desire of the living being. The Lord as Paramātmā helps the living being to get material happiness because the living being is helpless in all respects in obtaining what he desires. He proposes, and the Lord disposes. In another sense, the living beings are parts and parcels of the Lord. They are therefore one with the Lord. In the Bhagavad-gītā the living beings in all varieties of bodies have been claimed by the Lord as His sons. The sufferings and enjoyments of the sons are indirectly the sufferings and enjoyments of the father. Still the father is not in any way affected directly by the suffering and enjoyment of the sons. He is so kind that He constantly remains with the living being as Paramātmā and always tries to convert the living being towards the real happiness.
(Srimad Bhagavatam---1:2:33---purport).

Every living being is searching after happiness, but no one knows where eternal and unlimited happiness is obtainable. Foolish men seek after material sense pleasure as a substitute for real happiness, but such foolish men forget that temporary so-called happiness derived from sense pleasures is also enjoyed by the dogs and hogs. No animal, bird or beast is bereft of this sense pleasure. In every species of life, including the human form of life, such happiness is immensely obtainable. The human form of life, however, is not meant for such cheap happiness. The human life is meant for attaining eternal and unlimited happiness by spiritual realization. This spiritual realization is obtained by tapasya, or undergoing voluntarily the path of penance and abstinence from material pleasure. Those who have been trained for abstinence in material pleasures are called dhīra, or men undisturbed by the senses.
(Srimad Bhagavatam---1:3:13---purport).

Real happiness is achieved by spiritual existence or by cessation of the repetition of birth and death. One can stop the repetition of birth and death only by going back to Godhead. In the material world, even by attaining the topmost planet (Brahmaloka), one cannot get rid of the conditions of repeated birth and death, but still we do not accept the path of attaining perfection. The path of perfection frees one from all material attachments, and thus one becomes fit to enter into the spiritual kingdom. Therefore, those who are materially poverty-stricken are better candidates than those who are materially prosperous. Mahārāja Parīkṣit was a great devotee of the Lord and a bona fide candidate for entering into the kingdom of God, but even though he was so, his material assets as the Emperor of the world were setbacks to perfect attainment of his rightful status as one of the associates of the Lord in the spiritual sky.
(Srimad Bhagavatam---1:19:4---purport).

This is an accurate example depicting how the living entity, because of lack of knowledge, runs after happiness outside his own self. When one understands his real identity as a spiritual being, he can understand the supreme spiritual being, Kṛṣṇa, and the real happiness exchanged between Kṛṣṇa and one's self. It is very interesting to note how this verse points to the body's growth from the spirit soul. The modern materialistic scientist thinks that life grows from matter, but actually the fact is that matter grows from life. The life, or the spiritual soul, is compared herein to water, from which clumps of matter grow in the form of grass. One who is ignorant of scientific knowledge of the spirit soul does not look inside the body to find happiness in the soul; instead, he goes outside to search for happiness, just as a deer without knowledge of the water beneath the grass goes out to the desert to find water.
(Srimad Bhagavatam---7:13:29---purport).