5 Paul makes distinctions here in his audience: "as many as have been baptized into Christ." There is one Lord, one faith, one baptism, The true baptism of the Holy Spirit, the only one needed, circumcises the heart, by plunging down sin and iniquity, and puts off the body of death and sins of the flesh so that we are without sin; a baptism into the death of Christ. The unquenchable fire burns up all the chaff (sin), after the floor (your heart) is thoroughly purged.
The Holy Spirit was also received from the laying on of the Apostle's hands. This appears similar to how Jesus gave the Holy Spirit to his Apostles when he breathed on them and said, "Receive the Holy Spirit. John 20:22. But the Apostles did not receive the baptism of fire until Pentecost, when they received power:
But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth. Acts 1:8 . The disciples had already received the Holy Spirit when Jesus breathed on them (above reference John 20:22) and told them to go to Jerusalem and wait for power, which is described as:
When the day of Pentecost had come, they were all of one accord in one place,
When suddenly a sound came from heaven like a mighty rushing wind, and it filled the whole house where they were sitting.
And what appeared to them, looked like cloven tongues of fire, and the fire rested upon each of them.
And they were all filled with the Holy Spirit, and began to speak with other tongues, as the Spirit gave them utterance. Acts 2:1-4.
The Apostles had a "laying on of hands" power, which is referred to as a baptism of the Holy Spirit; but this was not the baptism of fire that burnt up the chaff, (burns away the sin), which occurs at the end of the journey, not the beginning. This power was limited to those who were in the Kingdom of Christ, having received power from on high. These men then watched over their flock, correcting, warning, exhorting, reproving, charging — to make sure they stayed on the true way, and not be seduced by the deceitfulness of sin. Today, we have no such perfect, pure, holy, empowered men to do the same. So, each man is developed completely by the Holy Spirit, tested, and then sealed with the earnest deposit of the Spirit, the promise of the completion to occur at the Second Appearance of the Lord. The Holy Spirit's development of men without a physical overseer around, is necessarily a much more selective process; taking much longer as well as being very careful to be certain any man, without an earthly overseer, will not stray off the path after receiving the earnest deposit — thus to bring great shame to the truth.