Yochanan 1:50

50 In reply, Yehoshua said to Natan’el, Because I told you that I watched you beneath the etz hate’enah, do you have emunah (faith)? Greater than these things you will see.

Yochanan 1:50 Meaning and Commentary

John 1:50

Jesus answered and said unto him
Not as reproving him for his faith, as if he was too credulous, and too easily gave into the belief of Christ, as the Son of God, and true Messiah, upon these single expressions of his; but as approving of it, and surprised at it:

because I said unto thee, I saw thee under the fig tree, believest
thou?
some read the words, not by way of interrogation, but as an assertion; "thou believest", or "hast believed", as the Vulgate Latin, Arabic, and Persic versions:

thou shall see greater things than these;
meaning that he should have larger discoveries of his person, nature, and perfections, and should see things done by him, much more surprising than any thing he had seen yet; referring to the miracles of raising the dead, casting out devils, and healing all manner of diseases.

Yochanan 1:50 In-Context

48 Natan’el says to him, How do you have da’as of me? In reply, Yehoshua said to him, Before you received your kri’ah (call) from Philippos, while you were beneath the etz hate’enah (fig tree, MICHOH 4:4; ZECHARYAH 3:10), I watched you.

49 In reply, Natan’el said to him, Rebbe, you are the Ben HaElohim [SHMUEL BAIS 7:14; TEHILLIM 2:7;89:26-27], the Rebbe, Melech HaMoshiach of Yisroel.

50 In reply, Yehoshua said to Natan’el, Because I told you that I watched you beneath the etz hate’enah, do you have emunah (faith)? Greater than these things you will see.

51 And he says to Natan’el, Omein, omein, I say to you, you will see Shomayim having been opened and malachim (angels) of Hashem ascending and descending on the Ben HaAdam [i.e, Moshiach DANIEL 7:13-14; TZEFANYAH 3:15; BERESHIS 28:12].