(Gospel) Seeing is not the same as believing.
On the dinning room table in front of my nose I saw the halfway decent drawing of the Blessed Virgin I had just finished, but I couldn't accept it - "I can't draw" was my conclusion.
"Coach, let me take this shot!" He replied "Let me see. How many can you make in a row?" The player then made 19 in a row, but coach wasn't convinced; he didn't allow him to shoot 3-pointers during a game.
The first is about faith in ourselves, the second about faith in others.
Today's readings are on another level, because they are about faith in God. Nicodemus in the Gospel, and the Gentiles and the peoples of Israel in the first reading, both SEE the signs that God works through Jesus and the apostles. But some believe and some don't.
We ALL experience signs all the time. But belief remains a free choice.