ONLY the elect saw! To the rest, it was all hidden. Have you never read:
Matt 11:20-26
20 Then Jesus began to denounce the cities in which most of his miracles had been performed, because they did not repent. 21 "Woe to you, Korazin! Woe to you, Bethsaida! If the miracles that were performed in you had been performed in Tyre and Sidon, they would have repented long ago in sackcloth and ashes. 22 But I tell you, it will be more bearable for Tyre and Sidon on the day of judgment than for you. 23 And you, Capernaum, will you be lifted up to the skies? No, you will go down to the depths. If the miracles that were performed in you had been performed in Sodom, it would have remained to this day. 24 But I tell you that it will be more bearable for Sodom on the day of judgment than for you."
25 At that time Jesus said, "I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. 26 Yes, Father, for this was your good pleasure.
NIV
Two groups of people; two lumps of clay. God took from one lump and made two lumps. One lump was the "little children" to whom God revealed His son; this group was the lump of clay prepared for noble purposes. The second lump consisted of the "wise and learned"; and this lump of clay was prepared for common or ignoble purposes.
In the final analysis it wasn't the external signs, wonders and miracles that produced faith. It was the invisible, internal, spiritual work of God in the disciples' hearts. Why do you think that one of the promises under the New Covenant is a new heart!?
And for those who doubt the doctrine of reprobation, read carefully the last two verses, And note carefully that both groups were acted upon by God for his good pleasure!