So our real problem is that we... Every one of us, we are the spirit soul, part and parcel of Kṛṣṇa. We are struggling for existence within this material world. So manaḥ-ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7), struggle for existence. Therefore Kṛṣṇa says that "Your real problem is janma-mṛtyu-jarā-vyādhi-duḥkha-doṣānudarśanam (BG 13.9)." We are eternal. We understand from Bhagavad-gītā, na hanyate hanyamāne śarīre (BG 2.20). So if I am eternal, nityaḥ śāśvata, then why I am accepting death? This is real question. But foolishly we are thinking, "I am this body." Therefore we remain as an animal. So we should be interested to understand actually "What I am," ahaṁ brahmāsmi. That is real solution of all problems. This is called knowledge. But sometimes we are misled by misleaders; therefore we still remain in darkness in spite of cultivating knowledge. But actually, when we cultivate knowledge under the guidance of real guru, then we can understand vasudevaḥ sarvam iti sa mahātmā su-durlabhaḥ (BG 7.19). This is confirmed in the Vedas, Brahma-saṁhitā:
- īśvaraḥ paramaḥ kṛṣṇaḥ
- sac-cid-ānanda-vigrahaḥ
- anādir ādir govindaḥ
- sarva-kāraṇa-kāraṇam
- (Bs. 5.1)
So spiritual knowledge means to become Kṛṣṇa conscious. This is the sum and substance, to understand Kṛṣṇa, what He is, not that concocting, manufacturing that "Kṛṣṇa is this. Kṛṣṇa is that." No. As Kṛṣṇa says, as śāstra says what is Kṛṣṇa, you have to understand it like that. So sādhu śāstra guru vākya. It is said that we have to accept knowledge through saintly person. Through śāstra and guru we have to understand. So Kṛṣṇa is accepted by all the sādhus and ācāryas. Śaṅkarācārya, Rāmānujācārya, Madhvācārya, Nimbārka, Viṣṇu Svāmī, Śrī Caitanya Mahāprabhu—all of them accepted Kṛṣṇa, the Supreme Personality of Godhead. So ācārya means one who has learned, taken knowledge from the śāstra, authoritative śāstra, Vedas. Therefore in the Bhagavad-gītā it is recommended, ācāryopāsanam. If you want real knowledge, then you must take knowledge from the ācāryas or the ācārya-paramparā. Then there is knowledge. Otherwise it is ignorance.