Spiritual kingdom is beyond this material world made of three modes of material nature, sattva-rajas-tamaḥ. So when incarnation of the Supreme Lord comes . . . Yadā yadā hi dharmasya glānir bhavati (BG 4.7), Kṛṣṇa has given us. We are fallen down from the spiritual kingdom to this material world on account of desiring to fulfill our material senses. But Kṛṣṇa is so kind that He has given us the Vedic literatures. Anādi bahir mukha jīva kṛṣṇa bhuli gela (CC Madhya 20.117). This is the statement in the Caitanya-caritāmṛta. Ataeva kṛṣṇa veda purāṇa karilā (CC Madhya 20.117). Because we have forgotten Kṛṣṇa, anadi . . . Anadi means before the beginning of this creation. The beginning of this creation is called ādi, beginning, but our forgetfulness of Kṛṣṇa is anādi. Anādi. Anādi bahir mukha. We are working in this life, in this material world, struggling for existence to get happiness. That is the aim of life. But because we have forgotten Kṛṣṇa, we do not know the source of happiness. Ānandamayo 'bhyāsāt (Vedānta-sūtra 1.1.12). The ānandamaya-vigraha, sac-cid-ānanda-vigraha (BS 5.1), we have forgotten Kṛṣṇa. Still, we are searching after ānanda, blissfulness. This is our struggle for existence. Manaḥ-ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). We are in this prakṛti, in this material nature, prakṛti-sthāni, and, being dictated by the mind, making plans to become happy. But that is not possible. Manaḥ-ṣaṣṭhānīndriyāṇi prakṛti-sthāni. This is . . . Due to our forgetfulness, we are struggling for existence to get happiness, but because we do not know what is the source of happiness, it is called struggle for existence. This is going on.
So this is going on not only in this life, before this life also, anādi, anādi. So once we get the chance to understand what is the problem of life, and this human life is given a chance.