Read the seven letters to the churches in chapters two and three of Revelation. At least one of these letters will pierce your heart. How many Christians have lost their first love (Rv 2:4) and become lukewarm! (Rv 3:16) Many, who have deceived themselves into a false sense of security (Rv 3:17), are dead, although they have the reputation of being alive (Rv 3:1). We must wake up, rouse ourselves (Rv 3:2-3), and repent (Rv 3:19).
At this moment, Jesus is saying personally to each one of us: "Here I stand, knocking at the door. If anyone hears Me calling and opens the door, I will enter his house and have supper with him, and he with Me" (Rv 3:20). "Now is the acceptable time! Now is the day of salvation!" (2 Cor 6:2) "Delay not your conversion to the Lord, put it not off from day to day" (Sir 5:8). "Delay not to forsake sins, neglect it not till you are in distress" (Sir 18:21).
We have no reason to assume that we will live another day or, even if we live, have another opportunity to give ourselves to Jesus. We only know that Jesus is knocking at the door now, knocking and calling. Which knock will be His last? When will He stop calling? Give yourself to Jesus immediately.