When Paul wrote this statement, he was appealing to the Hebrews deep knowledge of "the LORD", or "YHWH", whose name means "Was, is, always."
The same LORD spoke the entire everything into existence:
"In the beginning, God created the heaven and the earth." (Genesis 1: 1)
He is there and does not change:
"For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counseller, The mighty God, The everlasting Father, The Prince of Peace." (Isaiah 9: 6)
"Everlasting Father" speaks of a parent who will never leave us nor forsake us (Hebrews 13: 5)
"For I am the LORD, I change not; therefore ye sons of Jacob are not consumed." (Malachi 3: 6)
For God, time is nothing:
"Behold, thou hast made my days as an handbreadth; and mine age is as nothing before thee: verily every man at his best state is altogether vanity. Selah." (Psalm 39: 5)
"For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night." (Psalm 90: 4)
"But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day." (2 Peter 3: 8)
You are now in Christ (1 Corinthians 3: 23), and Christ is in you (Colossians 1: 27), and in Christ we can do all things (Philippians 4: 13) and every need is met in Him (Colossians 4: 19)
Receive this with peace and rest, for He is outside of time itself, above every circumstance and concern ahead of you or behind:
"Thou knowest my downsitting and mine uprising, thou understandest my thought afar off.
3Thou compassest my path and my lying down, and art acquainted with all my ways." (Psalm 139: 2-3)