Here's what my Life Application Bible has to say about this verse...
"Because God was guiding his ministry, Paul wasn't doing anything that God hadn't already planned & given him power to do.
"God knows you intimately as well, & he chose you to be His even before you were born (see Psalm 139).
"He wants you to draw close to Him & fulfill the purpose He has for your life."
My belief continues to be that God dreamed for each of us a BIG life - one that fits us & fits into God's overarching plan for humankind.
All we have to do is surrender to Him, completely, & His will & His dream for our life will find us.
I know, because I'm livin' it!