Now to be clear, this work is the result of the grace we have been given, not the cause of it. There is nothing we can do to earn the grace of God, we are sinners and all our good deeds are as filthy rags before God, so we need to get that idea out of our minds forever. In our sin, nothing we can do is pleasing to God, but Christ is. Jesus lived a perfect life fully pleasing to God, and He graciously covers all people He brings to Himself in this righteousness. We are pleasing to God only because of Christ, so now because of this grace and through the strength God gives us, it is time to work.
We need to...
1. Work toward a deeper relationship with God through communion with Him. Let me just say it and take whatever objections may come; asking God to speak to us outside of His word is spiritual laziness. In His Word, God has given us everything we need to know both for our relationship with Him and for life. But lets face it! Studying scripture is work! Perseverance in the study of the Bible is an area that I struggle, but when God gives me victory I am able to reap the sweet benefits of hearing Him speak to my heart through the word. So let us work hard through the spirit to seek God through His word.
Communion, however, is two ways. It takes work to hear from Him, and it takes work to talk to Him. We have to be totally honest with the one who sees our hearts, and this takes a lot of effort because most of the time we aren't even honest with ourselves.
2. Work to put off sin. We must work to kill the sin that remains in our lives and keeps us form a deeper relationship with God. As Hebrews 12:1 puts it, "let us also lay aside every encumbrance and sin which so easily entangles." Christians, in the words of John Owen, "be killing sin, or it will be killing you."
May the Holy Spirit fill us with the strength we don't have to work hard after a deeper relationship with our God.
For His glory
Seth