Paul is thankful to God for opening the eyes of the hearts of the Ephesians and granting to them faith, which is demonstrated in their love for the brethren. Paul talks about the hope we have in Christ. This hope is not wishful thinking but a certainty built upon the surety of God’s character.
Ephesians 1:15019 (ESV)
15 For this reason, because I have heard of your faith in the Lord Jesus and your love toward all the saints, 16 I do not cease to give thanks for you, remembering you in my prayers, 17 that the God of our Lord Jesus Christ, the Father of glory, may give you the Spirit of wisdom and of revelation in the knowledge of him, 18 having the eyes of your hearts enlightened, that you may know what is the hope to which he has called you, what are the riches of his glorious inheritance in the saints, 19 and what is the immeasurable greatness of his power toward us who believe, according to the working of his great might