Any devotee who has developed genuine love for Krishna can also explain the truth about Krishna because Krishna helps such sincere devotee, being seated in his heart.
Krishna is within your heart. If you continue to hear about Him then Krishna will be very much pleased. “Oh, this person is now interested in me.” Because nobody is interested in Krishna, so Krishna is also silent to them. But as soon as you become interested, oh, Krishna becomes very active. “Oh, he is trying to do something. I shall help him.”