Imam Ibnul Qaiyum said:

Temptations which are presented to the heart are a cause for its sickness, it is the temptations of desires and temptations of doubts…..

Imam Albani commented saying:

They [the temptations of desires and doubts] are the origin for every evil.

[Ighaathatul Lahfaan 1/42]

Translated by

Majid Jawed Al Afghaanee
Abu Layl