So there are many yoga-siddhis. People become very much puzzled by seeing these yoga-siddhi. But Kṛṣṇa says, yatatām api siddhānām: "Amongst many such siddhas who have got yoga-siddhi," yatatām api siddhānām kaścid vetti māṁ tattvataḥ (BG 7.3), "somebody may understand Me." So one may achieve some yoga-siddhis; still, it is not possible to understand Kṛṣṇa. That is not possible. Kṛṣṇa can be understood only such persons who has dedicated everything to Kṛṣṇa. Therefore Kṛṣṇa wants that, demands, sarva-dharmān parityajya mām ekam śaraṇaṁ (BG 18.66). Kṛṣṇa is only understandable by His pure devotee, not anyone else.
- athāpi te deva padāmbuja-dvaya-
- prasāda-leśānugṛhīta eva hi
- jānāti tattvaṁ. . .
- na cānya eko 'pi ciraṁ vicinvan
- (SB 10.14.29)
Those who are favored by the causeless mercy of Kṛṣṇa, they can understand Kṛṣṇa. Others, na cānya eko 'pi ciram vicinvan. Ciram means for long time, for many years, if they speculate only what is God or what is Kṛṣṇa. . . That process will not help us. There are many Vedic version like that