Confess

Now there was a man of the Pharisees named Nicodemus, a ruler of the Jews. This man came to Jesus by night and said to him, “Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do unless God is with him.” Jesus answered him, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God...” (John 3:1-6)

Nicodemus, who had gone to him before, and who was one of them, said to them, “Does our law judge a man without first giving him a hearing and learning what he does?” They replied, “Are you from Galilee too?... (John 7:48-52)

...the Jews had already agreed that if anyone should confess Jesus to be Christ, he was to be put out of the synagogue. (John 9:22b)

Nicodemus also, who earlier had come to Jesus by night, came bringing a mixture of myrrh and aloes, about seventy-five pounds in weight. (John 19:39)

Helping in the burial of Christ was a pretty public confession that Nicodemus was a follower of Jesus. Here we see a leader, a Pharisee, a teacher of Israel giving it all away to follow Christ. Here was a man who lived out Mark 8:36 "For what does it profit a man to gain the whole world and forfeit his soul?" Nothing else matters, only Jesus.

So, as another ex-Pharisee said,

For I decided to know nothing among you except Jesus Christ and him crucified. (1 Cor 2:2)