The Absolute Truth is one. One who knows the Absolute Truth, he knows that Brahman, Paramātmā, Bhagavān, the same objective, but they are realized by different devotees or different knower in different features.
The example is given in this connection: Just like if you see from a very distant place one hill, you'll find just like a cloud, hazy cloud. If you push forward further, you'll find something green. But when you actually approach the hill, you'll find there are many houses, many animals, many trees—varieties.
So the Absolute Truth, when it is realized by our limited understanding, the Absolute Truth appears as nirviśeṣa, impersonal Brahman. Similarly, when we try to meditate upon the Absolute Truth within our heart, He appears as Paramātmā. Yogīs . . . dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1).
But at the ultimate issue, He's Vāsudeva, Kṛṣṇa, origin. Advaitam acyutam anādim. Anādi: Kṛṣṇa has no source. He's the original source of everything. Janmādy asya yataḥ (SB 1.1.1). Ahaṁ sarvasya prabhavaḥ (BG 10.8). These things are there.
So Kṛṣṇa is the original cause of everything, cause of all causes. But He is independent, svarāṭ. That is described in the beginning of Śrīmad-Bhāgavatam. Janmādy asya yataḥ anvayāt itarataś ca artheṣu abhijñaḥ svarāṭ (SB 1.1.1). Svarāṭ means completely independent. He's not caused by any . . . anyone. And He says also in the Bhagavad-gītā: mattaḥ parataraṁ nānyat kiñcid asti dhanañjaya (BG 7.7). So He's the origin, Vāsudeva. Therefore all activities should be targeted to Vāsudeva. Vāsudevaḥ sarvam iti (BG 7.19). This is the aim of life.
Unfortunately, they do not know it. People in general, they do not know it. That is ignorance. This material world is full of ignorance. Therefore it is called tamas. Tamas means darkness. We do not know. The human civilization, at the present moment at least, it is always . . . at the present moment, it is completely in darkness that they do not know what is the aim of life.