1 Peter 4:4-5

4 In all this, they are surprised that you do not run with them into the same excesses of dissipation, and they malign you;  5 but they will give account to Him who is ready to judge the living and the dead.

Any time a believer who is living by faith mixes with non-believers, they will be surprised at his different lifestyle—that he does not indulge himself (in words or actions) as they do. Most of them think it is odd behavior. But a suppose some, secretly, wish they could be as he is. Peter gives this warning: that all will give an account to God for what they do (Rev. 20:11-15).