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There's no argument against being filled with God's Spirit: but if a person does not walk in the Spirit, are they under condemnation? Maybe I misread that.
If someone is saved they have the Holy Spirit indwelling in them. Ephesians 1:13 says, "And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit." So, a saved person has the Holy Spirit indwelling them, but they will suffer more because they are willingly giving themselves to sin (whatsoever is not of faith is sin: Romans 14:23). When walking in the flesh (the old creation) the person is a lot less effective in spreading the Gospel. Even though they may be a good example and may say what they have learned from Christ, they will not have these things combined with God's power and words working through them. They will be using their own words to convince the unbeliever. Nevertheless, God will even use unbelievers to spread his gospel because he will have the Holy Spirit prompt people to accept and believe the message for it is the voice of the Holy Spirit that convinces the person. For example, the unsaved person can quote bible verses about the gospel in a derogatory manner meaning to turn someone away from believing, yet God willuse the Holy Spirit to convince the unbeliever of the truth of the verses, apart from the one speaking, and they will still get saved. A believer walking in the flesh (spreading the gospel only because they are commanded to, not because they have a deep desire and love from the Holy Spirit compelling them) is much like the unbeliever when spreading the gospel, yet often with more enthusiasm behind it.
The one walking in the Spirit however suffers less in the world because they are not living from the world, but from the kingdom of God within them. They have the fruit of the Spirit, like love, joy, peace (that is not an earthly love, joy, and peace but a supernatural love, joy, and peace filled with life) filling them. This fruit is combined with wisdom and God's perspective moment to moment giving the believer fulfillment no matter what the circumstances. The believer walking in the Spirit is much more effective at spreading the gospel because by faith they are giving themselves fully to allow God to speak through them and tell them what actions they should do to spread his love. God may tell someone to do something unconventional, yet God knows, even when we don't, what will work. When the Spirit of God speaks through the person, not just words, but living words come out of the person and many will know there is something different and powerful in those words and they will listen because God's life in the words is being spoken to them. When someone walks in the Spirit their actions emanate the beauty of God's Spirit and people know their is something different and beautiful about that person so they will be eager to hear, because they will want the real love and power that they feel for themselves.
Walking in the Spirit is moment to moment existence in God's life. Believers have the seal and are always saved, but often walk between living as the old man (by their own desires, feelings, thoughts etc.) and submitting to the new creation that God sees them as in Christ. When a believer walks in the Spirit they are communing with God in God's kingdom which is within them and acting from the Spirit of God's kingdom, rather than their old nature in the world. All believers should press onward to cast away all worldly thoughts, with the desire and faith to live in God's thoughts, since we have the mind of Christ now. Living in the Spirit is living a spiritually rich life that not only blesses oneself but blesses others as well.