In order that in the coming ages he might show the incomparable riches of his grace, expressed in his kindness to us in Christ Jesus.
NIV
He did this that He might clearly demonstrate through the ages to come the immeasurable (limitless, surpassing) riches of His free grace (His unmerited favor) in [His] kindness and goodness of heart toward us in Christ Jesus.
AMP
That in the ages to come he might shew the exceeding riches of his grace in his kindness toward us through Christ Jesus.
KJV