How can we believe that Krishna is there?

Q: How can we believe that Krishna is there?

A: 1) Great saints have realized that Krishna is here.
2) The scriptures like Bhagavad-Gita and Srimad-Bhagavatam affirm Krishna's existence.
3) By following Krishna's instructions in Bhagavad-gita, one can see how one's life improves.

Q: If Krishna does not show himself then how will we know that he is there? We know him only by the deity, how will we show great affection to him? He has to at least come and speak to us.

A: Krishna shows Himself as the deity and as the holy name. To see him personally before you in his spiritual form, you require great qualification. Just as you cannot demand the president of a country to appear before you, you cannot demand that the Lord appears before you.