Nathanael answered, and saith unto him, Rabbi, thou art the Son of God (su ei o uio tou qeou).; for thou art the King of Israel. [John]
Whether Nathanael witnessed Jesus being baptised by John the Baptist or not, is unknown and Philip implies that Nathanael was not there.
[Matthew 3:16] And Jesus, baptized,went up straightway out of the water: and, lo,the heavens opened unto him, and he saw the Spirit of God descending likea dove, and lighting upon him: 17 and lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased.
Nathanel pieced together of who Jesus was from Peter’s confession [Matthew 6:69 ; Matthew 16:16] or even Martha’s testimony [John 11:27]. Still Nathanael goes even further than any of them & states “Thou art King of Israel (Basileu ei tou Israhl).” This is profound coming from Nathanael because made a lot of questionable comments about Jesus “Nathanael said unto him, Can there any good thing come out of Nazareth? Philip said, Come and see. [John i:46}. If ever there was a change of heart, Nathanael is it; talk about being born again!
Nathanael, calls Jesus, King, using Messianic titles from the Psalms 2:1-12.
Be wise now therefore, O ye kings:
be instructed, ye judges of the earth.
11 Serve the Lord with fear, and rejoice with trembling.
12 Kiss the Son, lest he be angry,
and ye perish from the way, when his wrath is kindled but a little.
Blessed are all they that put their trust in him.
Psalms 2 10-12 KJV
So, kings, be wise.
Rulers, learn this lesson.
11 Obey the Lord with great fear.
Be happy, but tremble.
12 Show that you are loyal to his son.
Otherwise you will be destroyed.
He can quickly become angry.
But happy are those who trust him for protection.
Psalm ii: 10-12 International Children’s version
In this version, the International Children’s Version, (also called the Ballerina’s version for little girls) they change the divine “blessed” and substitute what is now the secular “happy”. , Webster’s 1828 is our source saying that happy meant blessed; the only reason you are happy is that God had blessed you but that meaning is now lost in our secular word, and could confuse those unaware of the nuance.
There are versions like the Bullinger’s Companion bible and the Cambridge Bible, that use happy instead of blessed because it is the literal translation, so do not ignore that just because you think it’s a secular usage instead to revive happiness as a touch from God.