I pray that out of his glorious riches he may strengthen you with power through his Spirit in your inner being
Ephesians 3:16 (NIV)
If you don't know how to pray for a fellow believer in the Lord Jesus Christ, here's a good place to start. God is gloriously rich. In a Biblical phrase, 'the cattle on a thousand hills are his'.
Everything we have, even if we're the richest person in the world, is on loan from God. I don't think Paul's especially thinking about money though. I'm sure he's carrying on from Ephesians 1 where he talks about us having every spiritual blessing in Christ.
If we have every spiritual blessing in Christ, then we can expect that He will strengthen us with power through His Spirit in our inner being. Just because we can expect that doesn't mean to say we don't need to pray for it. God's a good Father, but we should still ask Him for good things.
It's not by worldly might or power, but by the Holy Spirit of God that we prevail. Every breath we breathe is a gift from Him. Eventually He'll call us home.
'Heavenly Father, please strengthen us with power through Your Spirit in our inner beings, out of Your glorious riches, for the honour of Your name, amen'