If you cross your conscience in big ways, (or a series of small violations) it will go against your heart. This has nothing to do with salvation if you are a believer in Christ, but what it will do is cause division, inner conflict, fear, guilt, a sense of inner condemnation, emptiness, and desperation in your soul.
As a favorite Tracy Chapman song says, “all you have is your soul.”
Also, we all will be dead soon, and we will all stand before God to be judged for sins (unbelievers); and we will be judged for rewards for service (believers).
Change your mind if you do the wrong thing, and live by faith in His grace, His love, His forgiveness, His cleansing, His Word, His truth, His promises, and His mercy.