The Promised Messiah (as) & Imam Mahdi (Guided One)
Morality is the key to other good deeds. Those who do not reform their morals gradually become lifeless. It is my belief that everything in the world serves a purpose. Even poison and filth has a use. Strychnine is useful as well and has an effect on the muscles. However, a human being who does not attain high morals and who is of no benefit to others, falls so low that they can be of no use whatsoever. Such a one becomes even worse than a dead animal, because the hide and bones of a dead animal can be used, but the skin of a dead man has no use whatsoever. It is at this state that a human being falls true to the following:
بَلۡ هُمۡ أَضَلُّۚ
They are even worse.
So remember that the reformation of one’s morals is imperative, because good morals are the mother of righteous deeds. 
- The Promised Messiah (as), Malfuzat-Volume 2 (Tilford, Surrey: Islam International Publications Ltd., 2019), 250.