Knowing Kṛṣṇa is not so easy thing. Therefore Kṛṣṇa says, manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye (BG 7.3). First of all you become siddha, perfect. Perfect means perfect knowledge. That is called siddha. And another siddha means very powerful, master of all yogic perfection. That is also siddha. Yogī is perfection, eight kinds of perfection: animā-laghimā siddhi prāptiḥ asita-vasita, prākāmyaṁ. So they obtain eight kinds of siddhis. They are also called siddhas.
From material point of view, a perfect yogī can counteract anything, and whatever he likes, he can do. That is called siddhi, aṣṭa-siddhi. But still, he is not as siddha as Kṛṣṇa. Kṛṣṇa's name is Yogeśvara. He is the master of all the yogīs. Yogeśvara. Yatra yogeśvaraḥ kṛṣṇaḥ (BG 18.78). The yogīs also, they are deficient with Kṛṣṇa's power. Still, some rascals, without any yoga siddhi, they claim that, "I have become God." What is your qualification? Have you got all the yoga-siddha? Then how you claim that you are . . .?
But rascals, they claim to become God, and other rascals, they also believe that, "Here is God." Both of them are animals. Śva-viḍ-varāhoṣṭra-kharaiḥ saṁstutaḥ puruṣaḥ paśuḥ (SB 2.3.19). One who does not know actually what is Kṛṣṇa, if he accepts somebody, some rascal, as God, then he is also animal. That is also animal. One who is claiming that, "I am as good as Kṛṣṇa," he is certainly animal, crazy. He does not know what is the power of Kṛṣṇa, how much He is Yogeśvara. Still, he is falsely claiming to become Kṛṣṇa.