A young man one day showed a little impatience to his aged father, who at his age could not hear very clearly, and had asked him three times to tell him again. Seeing the disturbed expression in his face, the father said: 'My son, do you remember that there was a day when you were a little child and asked me what the bird was? And I said to you: 'The sparrow.' You perhaps asked me fifty times and I had the patience to repeat it to you again and again, without being hurt or troubled about it. Only I was pleased to tell you all I knew. Now, when I cannot hear you clearly, you can at least have patience with me if I did not hear you once, to explain to me twice.'