Oh, that what you wrote in the last sentence of your remarks above were true! As this thread illustrates, though, such isn't actually the case. Some believers are determined to contribute to the perfectly-accomplished, atoning, saving work of Christ with their own self-effort, laboring to be righteous under the frightful idea that, if they don't, God will boot them out of His family and kingdom.
It is fear that motivates this sort of obedience to God, not love, and behind the fear is self-interest, not the Spirit. You can see this in how obey-or-else believers talk about why they ought to obey. A deep desire for God (love) doesn't come into it, really, at all. Self-preservation is the motivation for obedience to God. "Do you want to go to hell?" they ask, quoting verses that seem to indicate that a believer's salvation is always dangerously-balanced on the edge of a precipice and will fall into damnation should they slack at all in their performance of God's will. These obey-or-else believers are occupied, not with Christ, enjoying the rest, satisfaction and peace they have in him, but with keeping themselves safe from a threatening Creator. God does not accept "obedience" that arises from such a self-centered, self-interested motive; for He wants us to obey because we love Him, not because we are constantly afraid of His rejection and wrath.
1 John 4:16-19 (NASB)
16 We have come to know and have believed the love which God has for us. God is love, and the one who abides in love abides in God, and God abides in him.
17 By this, love is perfected with us, so that we may have confidence in the day of judgment; because as He is, so also are we in this world.
18 There is no fear in love; but perfect love casts out fear, because fear involves punishment, and the one who fears is not perfected in love.
19 We love, because He first loved us.
The apostle John wrote of not just knowing about God's love but believing it and thus coming to abide in Him. He wrote nothing in the passage above, though, about the role of constant, careful obedience to God in his explanation of how one comes to "abide in God." And in this passage, John eradicates the idea that self-interested fear has any place in abiding in God, indicating that the love-motive and the fear-motive are mutually-exclusive things, love "casting out" the tormenting fear of divine punishment (ie. - losing one's salvation). Firmly convinced of the love of God for them, born-again believers can "have confidence in the Day of Judgement." The child of God settled well into the truth of God's awesome, unchanging, faithful love for them finds, in particular, liberty from the craven fear of punishment, obeying and serving God because they love Him rather than because they fear for themselves, anxious God will cast them out if they don't "step right."
Romans 8:38-39 (NASB)
38 For I am convinced that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers,
39 nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in Christ Jesus our Lord.
Hebrews 13:5 (NASB)
5 ...for God Himself has said, "I will never desert you, nor will I ever forsake you,"
In light of what John wrote, it always puzzles me how eager some fellow believers are to urge on their brethren a self-preserving, fear-centered "obedience" to God. They seem to have forgotten what the First and Great Commandment is; or, if they do acknowledge it, they offer mere lip-service to the command, typically conflating obedience with love, mistaking effect for cause, making the two things synonymous (which they aren't). But Paul wrote that, no matter what a believer might say, or know, or do, if it isn't all coming from a deep desire - love - for God, it's all entirely spiritually useless.
1 Corinthians 13:1-3 (NASB)
1 If I speak with the tongues of men and of angels, but do not have love, I have become a noisy gong or a clanging cymbal.
2 If I have the gift of prophecy, and know all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but do not have love, I am nothing.
3 And if I give all my possessions to feed the poor, and if I surrender my body to be burned, but do not have love, it profits me nothing.
All the fear-based, rule-focused obedience to God that certain believers are eager to promote to their brothers and sisters in the Lord is spiritually useless, rejected by God because it arises from an ultimately self-centered, self-protecting motive, not from a profound longing, thirsting, hungering, for Himself. Beware these folk! They will move you away from God, not toward Him!