There is a lot of confusion about the baptism of the Spirit.  Often times it is taught that there is an instance subsequent to conversion when the Spirit does something to a believer to make him more powerful or useable.  I see no evidence of this in the Bible.  When the Bible speaks of the baptism of the Spirit, for example in Mark 1:8[1] and Acts 11:15-17[2], it is in the context of repentance unto salvation, that is conversion (see Acts 11:14[3]).  Thus, the baptism of the Spirit is a baptism into Christ as Romans 6:4[4] explains. 

Here is why this matters.  Some think that they are advanced believers because they are baptized in the Spirit while other Christians are not.  They might think that they have the additional ability to have spiritual power or ability.  The reality is that this denies some fundamental theological points, namely the sufficiency of Christ and the sufficiency of His Word.  It also denies the priesthood of all believers.  Each of us in Christ have access to all wisdom and knowledge (Colossians 2:3) because we have Christ.  2 Peter 1:3 teaches us that we have all we need for life and godliness in Christ.  This does not happen after a certain mystical experience following conversion, but it happens through knowing Jesus.  Ephesians 1:3 teaches that in Christ we have every spiritual blessing.  We don’t have to seek a subsequent experience because we already have all of Christ, the Spirit, and all that He provides.  The issue in the Christian life is whether or not we are giving ourselves totally to Him so that He can fill us, lead us, guide us, and use us.  This is what we ought to concern ourselves with.