You do not know which day.
No one knows when Christ will return. Therefore, it is imperative that every action honors God. Christians practice self-control out of righteous concern. What decisions are you making that hinder your ability to follow? “Throw off everything that hinders and the sin that so easily entangles. Run with perseverance the race marked out for us” (Heb. 12:1). Repent from sin and strive for righteousness.
Pray to be prepared.