There are different kinds of activities—karma, jñāna, yoga, especially. Everything, all activities are grouped under three headings. One is karma, fruitive activities. People are working to get some desired result for sense gratification. That is generally. Everyone is working to get some money, and money means to satisfy senses, my demands of the senses. This is called karma.
Then, out of many millions of such karmīs, or worker, one is jñānī, or a man in knowledge. When a man comes into the platform of knowledge, when he becomes frustrated by working hard and tasting all results of karma, when one is not satisfied, then he comes to the platform of knowledge. Knowledge means inquiry—"What I am? Why I am frustrated? Why I am confused? What is my position?" That is the platform of knowledge.
So out of many thousands of such persons who have attained knowledge actually, who have understood what is the position of these living entities, brahma-bhūtaḥ, they are called liberated. And out of many thousands of such liberated persons, one can understand what is Kṛṣṇa. This is the position.