Hakim al Umma Maulana Ashraf Ali Thanvi (Allah have mercy on him) instructed,

‘If Satan creates a doubt in any of the beliefs (aqaid) recite لا حول ولا قوہ الا باللہ and push it away. Do not pursue it excessively.

If it does not go away then mention it to a Sufi-scholar. Even if his reply doesn’t provide any relief then tell yourself that I accept it without any proof. By doing so Satan becomes completely incapable (of misleading) and runs away.’

Ta’leem ut Talib, #5, p22-3