A man may know about the whole world's doings, saying to himself, "In the morning I will go from my home to the office, and will find out all about the world from my paper before I go." But all he has learnt is what the newspapers feed him with; for how often next day is the news of today contradicted! Still he is satisfied, thinking he has learned so much about the world in the morning. And in the evening he is ready to discuss these topics at the dinner-table, and next day there is again something fresh; but is that knowledge?