2 Timothy 2:19b

The Lord certainly knows those who are his. However, Paul also adds that those who call upon the name of the Lord are those who abstain from wickedness. It certainly is reassuring that the Lord knows those who are his; however, keeping from wickedness is something important that followers of Christ do. This certainly isn't by our power, but by his. We cannot save ourselves, and it is only by grace, through faith, that we are saved. To merely trust and hope that the Lord knows who are his, while at the same time, continuing to grow in wickedness would be to fool yourself.