Continuing in Ephesians 3, Paul prays for the fulfillment of this eternal purpose: "14 For this reason, I fall on my knees before the Father, 15 from whom every family in heaven and on earth receives its character, 16 I pray that from the treasures of his glory he will empower you with inner strength by his Spirit, 17 so that the Messiah may live in your hearts through your trusting.  Also I pray that you will be rooted and founded in love, 18 so that you, with all God's people, will be given strength to grasp the breadth, length, height and depth of the Messiah's love, 19 yes, to know it, even though it is beyond all knowing, so that you will be filled with all the fullness of God." (Ephesians 3:14-19 CJB)
 
David Stern comments on verse 18 regarding the breadth, length, height and depth of the Messiah's love: "Yeshua's love has breadth; one can see the breadth of his love throughout the Gospel narratives.  In addition, since his love has length it continues forever, since it has height it carries one's spirit upward into the very presence of God, and since it has depth it meets anyone even in the most dire distress and depression.  Compare Psalm 139."  (Jewish New Testament Commentary, p. 589) 

In Psalm 139, David writes of the depth and vastness to God's love in a very personal way, of how God knows him very well and has laid his hand on him. "1 ADONAI, your have probed me, and you know me. 2 You know when I sit and when I stand up, you discern my inclinations from afar, 3 you scrutinize my daily activities.  You are so familiar with all my ways 4 that before I speak even a word, ADONAI, you know all about it already. 5 You have hemmed me in both behind and in front and laid your hand on me. 6 Such wonderful knowledge is beyond me, far too high for me to reach."  Continuing, David prizes God's thoughts toward him: "17 God, how I prize your thoughts!  How many of them there are! 18 If I count them, there are more than grains of sand; if I finish the count, I am still with you."  He prays for God to examine and lead him: "23 Examine me, God, and know my heart; test me, and know my thoughts. 24 See if there is in me any hurtful way, and lead me along the eternal way. (Psalm 139:1-6, 17-18, 23-24 CJB)
 
God's eternal purpose and the vastness of his love are shown in John 3:16, "For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life." (NKJV) In Romans 11, Paul urges Gentile believers in Yeshua, Jesus, to live in such as way that their Jewish friends would see the Messiah's love in their lives causing them to want to know him too.  He writes in Romans 11 to his Gentile friends, "30 Just as you yourselves were disobedient to God before but have received mercy now because of Israel's disobedience, 31 so also Israel has been disobedient now, so that by your showing them the same mercy that God has shown you, they too may now receive God's mercy. 32 For God has shut up all mankind together in disobedience, in order that he might show mercy to all." (Romans 11:30-32 CJB)
 
God foreknew that Israel would at first reject their Messiah, and that this would have the effect of the Good News of reconciliation with God going out to the world at large.  Paul is declaring that those who believe in the Messiah and consistently obey him out of love will ultimately cause Yeshua's physical relatives to want to know him too. Contemplating this secret plan now revealed, Paul declares, "O the depth of the riches and the wisdom and knowledge of God! How inscrutable are his judgments!  How unsearchable are his ways!" (Romans 11:33 CJB)
 
Paul's teaching builds on the words of Jesus in John 13: "34 A new commandment I give to you, that you love one another; as I have loved you, that you also love one another. 35 By this all will know that you are My disciples, if you have love for one another."  (John 13:34-35 NKJV)  Seeing the love of Jesus in a person's life causes unbelievers to want to know him too.  This happened to me when I heard Tarel Russell singing about Christ her King at the Marin Civic Center in January 1977. The love of the Messiah she expressed caused me to want to know him too.  Likewise, Josh McDowell's father came to Jesus when he saw Christ's love being expressed through his son.  Many other examples could be given of how the love of Jesus expressed through lives of believers creates a thirst in others to know him too.
 
Paul finishes his prayer in Ephesians 3, "20 Now to him who by his power working in us is able to do far beyond anything we can ask or imagine, 21 to him be glory in the Messianic Community and in the Messiah Yeshua from generation to generation forever. Amen." (Ephesians 3:20-21 CJB)  When we pray according to his will, he does far more than anything we can ask or imagine.  We can come boldly before his throne of grace, knowing that Jesus has paid the price for our eternal life, and that God "is not willing that any should perish, but that all should come to repentance." (2 Peter 3:9 NKJV)  Believers reconciled to God through faith in Christ participate in his eternal purpose as described by Paul in 2 Corinthians 5: "20 Therefore we are ambassadors of the Messiah; in effect, God is making his appeal through us.  What we do is appeal on behalf of the Messiah, Be reconciled to God! 21 God made this sinless man to be a sin offering on our behalf, so that in union with him we might fully share in God's righteousness." (2 Corinthians 5:20-21 CJB)