If the first inward thought is not warded off, it will generate a desire, then the desire will generate a wish, and the wish will generate an intention, and the intention will generate the action, and the action will result in ruin and divine wrath. So evil must be cut off at its root, which is when it is simply a thought that crosses the mind, from which all the other things follow on.
Al-GhazaliAre you ready to cut off your head and place your foot on it? If so, come; Love awaits you! Love is not grown in a garden, nor sold in the marketplace; whether you are a king or a servant, the price is your head, and nothing less. Yes, the cost of the elixir of love is your head! Do you hesitate? 0 miser, It is cheap at that price!
Al-GhazaliWhen you have a bad suspicion about a Muslim in your heart, you should increase your consideration toward him and make dua for him. This way you will infuriate Satan and will be able to drive him away. Because of this, Satan will be reluctant to put evil thoughts into your heart, afraid that you would increase your consideration towards your brother and will make dua for him again.
Al-Ghazali