Where can I find the source of the following story about the Rebbe of Kotzk?

[At a Shabbat dinner, a chassid once told the Rebbe of Kotzk, "I love fish." The Rebbe responded, "**You don't love fish**. If you loved the fish, you would not have killed it and cooked it on a fire."][1]


How does this fit with Kohelet - Chapter 5

[9. Whoever **loves silver** will not be sated with silver, and he who loves a multitude without increase-this too is vanity.][2] - ?


  [1]: http://www.chabad.org/parshah/article_cdo/aid/800124/jewish/Can-Love-Overcome-Resentment.htm
  [2]: http://www.chabad.org/library/bible_cdo/aid/16466#v=9