The ultimate purpose of life is to show that Jesus is more precious than life.
The suffering of sickness and the suffering of persecution have this in common: they are both intended by Satan for the destruction of our faith, and governed by God for the purifying of our faith... Christ sovereignly accomplishes His loving, purifying purpose, by overruling Satan's destructive attempts. Satan is always aiming to destroy our faith; but Christ magnifies His power in weakness.
The purpose of the Lord's Supper is to receive from Christ the nourishment and strength and hope and joy that come from feasting our souls on all that He purchased for us on the cross, especially His own fellowship.
All that looks like reality to us is dependent on God. There is creation and Creator, nothing more. And creation gets all its meaning and purpose from God.