In the graph above, we see the Lord's very real (although often unrealized) prophetic act of fulfilling His promise that "I will be with you" throughout the life of a Believer. Even before we come to saving faith, we can review our life and realize that God was with us in special, and sometimes critical, times.
Below...the quote from Psalm 23:6 agrees with many similar promise-prophecies, such as Hebrews 13:5, " I will never desert you, nor will I ever forsake you", which applies both to this life and eternal life. Joshua received a very similar prophecy in Joshua 1:5, and at the end of his life declared "not one word [of the Lord]...has failed" (23:14). It is the same for you. God is fulfilling His prophecy to be "WITH YOU."