In one of his most eloquent sayings in relation to the...
Thus, it is only true faith in Allah (Glorified and Exalted is He) which can prevent a person from this sort of trespassing (through his thoughts), since a Muslim has firm conviction that Allah (Glorified and Exalted is He) sees all of the actions that he performs and is even aware of his inner thoughts.
The Dangers of Being Pessimistic About Others The first result of distrusting others will return back to the person who himself possess this trait, since a person who does not trust others will never be able to imagine that others can do things without any (hidden) motive. Therefore, in addition to causing himself spiritual difficulties and putting his soul through troubles, one will lead a difficult life.
Also, the burning and passion that are brought about through one’s imagination and thoughts will only increase the (mental) torture of a person. Being pessimistic and not trusting other people also destroys the roots of friendship and harmony amongst people. The person who thinks bad about others will always imagine such people as being treacherous and will feel that their friendship is something that is not stable or is not built upon faithfulness (to one another).