Tim Challies writes:
Though Satan can never steal the Christian’s crown, though he can never snatch him away from the hand of the Father, he is so envious and malicious that he will leave no stone unturned in robbing Christians of comfort and peace, in making their life miserable, in giving them reason to live in constant sorrow and mourning, doubt and questioning.
Puritan Thomas Brooks once identified eight ways in which Satan keeps Christians—Christians like you!—in this sad, doubting, questioning, condition.