It is not by our own efforts that we can know Krishna. Krishna can only be known when He lets Himself be known. Even if we want to think of Krishna, Krishna has to agree to appear in our minds. That is what it means to be Supreme. He is Supreme and therefore He can do whatever He wants. So if we want to overcome the influence of illusory energy, one has to feel himself completely dependent on Krishna.
February 18, 1994, Riga