"Remember therefore how you have received and heard; hold fast and repent. Therefore if you will not watch, I will come upon you as a thief, and you will not know what hour I will come upon you." (Rev. 3:3)
Many are saying let's just be ready. So how does one know they are ready for His coming? If you died today and your sins are washed away by His blood (Rev. 1:5), then you're ready to join the Lord in heaven. You're not necessarily ready for His coming. If being saved meant you were ready for His coming then the warning by Jesus to repent and watch would be meaningless.