What is more evil your heart /the devil?

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Help on this why is more evil you heart /the devil. We always think that the devil is bad but have we think that what we did wrong is dedicated by our heart and the n transmit it to our brain and our body do it.For instance your a married person and on your way to the park , on the street, in thwe mall. You see this person lokking good and sexy too. You sometimes wish that,that person is the person you marriage but not. You're doing is a sin already coz you have someone else,and still your wishing of theat person.No one dictate it to you not even the devil. Your heart wish it for you.And then you have sin already.I hope that I'm wrong but just as well.I like your respond to it what is your view.