"Likewise you also, reckon yourselves to be dead indeed to sin, but alive to God in Christ Jesus our Lord" Romans 6:11
"I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God." Romans 12:1-2
This brings us to our teaching in Mark 8:34-38. In these verses, Jesus lays out what our role as believers is, and it is very clear.