Dania, I'm quoting a few texts for you to consider. I think as you continue reading the Bible, you will be better able to understand how things fit together in context.
Romans 8:9 You, however, are controlled not by the sinful nature but by the Spirit, if the Spirit of God lives in you. And if anyone does not have the Spirit of Christ, he does not belong to Christ. 10 But if Christ is in you, your body is dead because of sin, yet your spirit is alive because of righteousness. 11 And if the Spirit of him who raised Jesus from the dead is living in you, he who raised Christ from the dead will also give life to your mortal bodies through his Spirit, who lives in you.
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1 Corinthians 12:12 The body is a unit, though it is made up of many parts; and though all its parts are many, they form one body. So it is with Christ. 13 For we were all baptized by one Spirit into one body--whether Jews or Greeks, slave or free--and we were all given the one Spirit to drink.
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2 Corinthians 1:21 Now it is God who makes both us and you stand firm in Christ. He anointed us, 22 set his seal of ownership on us, and put his Spirit in our hearts as a deposit, guaranteeing what is to come.
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2 Corinthians 3:1 Are we beginning to commend ourselves again? Or do we need, like some people, letters of recommendation to you or from you? 2 You yourselves are our letter, written on our hearts, known and read by everybody. 3 You show that you are a letter from Christ, the result of our ministry, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.
2CO 3:4 Such confidence as this is ours through Christ before God. 5 Not that we are competent in ourselves to claim anything for ourselves, but our competence comes from God. 6 He has made us competent as ministers of a new covenant--not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.
2CO 3:7 Now if the ministry that brought death, which was engraved in letters on stone, came with glory, so that the Israelites could not look steadily at the face of Moses because of its glory, fading though it was, 8 will not the ministry of the Spirit be even more glorious? 9 If the ministry that condemns men is glorious, how much more glorious is the ministry that brings righteousness! 10 For what was glorious has no glory now in comparison with the surpassing glory. 11 And if what was fading away came with glory, how much greater is the glory of that which lasts!
2CO 3:12 Therefore, since we have such a hope, we are very bold. 13 We are not like Moses, who would put a veil over his face to keep the Israelites from gazing at it while the radiance was fading away. 14 But their minds were made dull, for to this day the same veil remains when the old covenant is read. It has not been removed, because only in Christ is it taken away. 15 Even to this day when Moses is read, a veil covers their hearts. 16 But whenever anyone turns to the Lord, the veil is taken away. 17 Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom. 18 And we, who with unveiled faces all reflect the Lord's glory, are being transformed into his likeness with ever-increasing glory, which comes from the Lord, who is the Spirit.
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Ephesians 1:13 And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit, 14 who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession--to the praise of his glory.
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Titus 3:3 At one time we too were foolish, disobedient, deceived and enslaved by all kinds of passions and pleasures. We lived in malice and envy, being hated and hating one another. 4 But when the kindness and love of God our Savior appeared, 5 he saved us, not because of righteous things we had done, but because of his mercy. He saved us through the washing of rebirth and renewal by the Holy Spirit, 6 whom he poured out on us generously through Jesus Christ our Savior, 7 so that, having been justified by his grace, we might become heirs having the hope of eternal life.
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1 John 3:21 Dear friends, if our hearts do not condemn us, we have confidence before God 22 and receive from him anything we ask, because we obey his commands and do what pleases him. 23 And this is his command: to believe in the name of his Son, Jesus Christ, and to love one another as he commanded us. 24 Those who obey his commands live in him, and he in them. And this is how we know that he lives in us: We know it by the Spirit he gave us.