HOW DO I TELL APART DEVIL WHISPERS FROM GOOD THOUGHTS?

The video goes through the definition of waswâs ( devil whispers) and land at the end on some key advice to deal with devil whispers
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اللهم صلى وسلم على نبينا محمد وعلى آله وصحبه أجمعين وسلم تسليما كثيرا إلى يوم الدين

THOUGHTS?