pudtadz daghdahguh pehvehruh chee puhr-nehl

Something that has deteriorated cannot perform as expected like rotten wood which has become soft due to decay. Such wood cannot hold a nail because it has become soft. Plywood and particle board can begin to decay of exposed to prolonged humidity. Once decayed, they become soft. Such wood cannot hold a nail.

Similarly, a person who has lost control of his sense of decency due to excessive desires and frustration that weaken the mind and determination to follow the path of virtue, will not be able to maintain a life of consistent good behavior. Sooner or later, such a person will become desperate or careless and commit some indiscretion.