The influence put into things is according to the intensity of the feeling. A note resounds according to the intensity with which you strike it. You may strike a note on the piano, and it will continue to resound for so long; and if you strike it with less intensity it resounds for a shorter time. But at the same time it is according to the strength with which you strike and the instrument on which you strike. There may be one instrument the string of which will continue to vibrate for a very long time; there is another instrument whose string will not vibrate for very long, and then it will quiet down. And so it is also according to the medium which you take in striking vibrations, that the effect is made.