Now, we know that we must always rely on the Spirit of God to bless our work, but even He wants us to practice good habits in our lives. Paul said in 1 Corinthians 9:27 ESV, "But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified."
Good discipline in our lives does several things:
First, we build up our strength and endurance to be ready when trials and difficulties come along. We often think of "boot camp" for a young soldier. There he or she is expected to build up their bodies in strength and to practice hard at their routines so they will be ready to face an enemy. We see this also in sports when training camp does the same thing. I've often admired the good soccer players who just keep running almost the whole game! I am impressed with their endurance! But I realize that couldn't have happened without days and weeks of constantly running to build up their stamina.
Second, practicing good discipline helps us "...to be ready for every good work" Titus 3:1. Knowing the Word of God, enjoying intimate moment-by-moment fellowship with your Savior, keeping your heart clean and daily confessing your sin and confessing your need of God's guidance permits you to "be ready" for all the opportunities the Lord provides for you to serve Him. Paul said, "For bodily exercise profits a little, but godliness is profitable for all things..." 1 Timothy 4:8.
Third, we not only add to our lives good habits, but we discipline ourselves to avoid the things that can harm us. 2 Timothy 2:4 ESV says, "No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him." This is also reinforced when someone came to Jesus offering to "follow Him" but then spoke of other priorities. Luke 9:57-62 speak of three would-be disciples that didn't have the disciplines they needed to truly follow the Lord. They were preoccupied with other "priorities."
Now, discipline by itself is not necessarily that great. We can actually make more of discipline than our relationship with Christ. The point of discipline is not the discipline itself. It's to help us be used of our Savior effectively for His glory. But without a good relationship with Christ all our ministry is "service without love." And that's why the Lord was upset with the Ephesians in Revelation 2:4. They were more in love with their ministry than they were with Christ.
Keep your love intimate with Jesus and practice good disciplines that will help you to "serve Him in love."