Improvidence (lack of care and attention) makes the belief shaky and destroys the endeavour of attaining it.
The Prophet of Islam (PBUH) said: “the best thing for your religion is your Wara’ [1].” Because if there is no Wara’ the human being becomes improvident and his/her religion is shaky, and after that the greed appears and destroys the belief [2].
* Wara’ means to refrain from all Harams as well as all doubtful acts (which some of them may not be Haram). If a person avoids Harams, he/she is considered to be a pious person; but Wara’ is a level higher than piety (Taqwa).
[1] Beharul Anwaar, Vol. 1, Page 167.
[2] Soluke Ashourayee, Manzele Chaharrom, Deen wa Deendari, Ayatollah Sheikh Mojtaba Tehrani (RA), Page 161.
Source: en.shafaqna.com