If nothing is required then how would someone know the Holy Spirit was in their lives?
We are not given a mark nor are we given a certificate such as we receive in baptism. So how?
No flesh will glory in God's Presence.
Anyone and all will know they are saved merely through God's Presence in their lives. Once God make His Presence known, believe me, YOU WILL know.
And there is a "mark" given to God's people. It is the stamp of the Holy Spirit. We never know who is to be saved, but once a person declares Christ, it is our responsibility to test the spirits WHETHER they are of God.
5 This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
6 If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:
7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make him a liar, and his word is not in us.
1 John 1:4–10.
9 Whosoever is born of God doth not commit sin;
for his seed remaineth in him: and he cannot sin, because he is born of God. 1 John 3:9.
There is no secret rapture and there is no secret Presence. When God shows up, believe me, people/YOU will know it.