Baptism in the holy ghost is not water baptism . Baptism is not regenerational.Nicodemus was circumcised,barhmitzvahed (something like today baptize and confirm),was religious learned in the one true ,patriarchal religion/( church today) yet he was not “born again”. When you are born again all things become new, you are a new creature, you cry out Abba Father, you “see” and understand spiritual things where before you did not, you can proclaim Him your Lord etc., you have assurance, you love the brethren, scripture, assembling where once you did not. Your spirit is alive unto God where before it was dead, in trespasses and sin .You cease from carnal attempts to please the Father .You rely totally on Calvary for justification for the first time.You no longer hope to be good to be saved. You no longer hope to fulfill the law and commandments to be saved, yet you have a fresh desire to be holy out of love for the received gift, not to be worthy of the gift .You realize what grace is .You have met Jesus Christ personally.