I bet I do. Jesus used many sources. Most of all His innate wisdom.
Luke 4 22 And all gave testimony to him: and they wondered at the words of grace that proceeded from his mouth, and they said: Is not this the son of Joseph?
What you probably don't know is that the parables which Jesus used were not completely original. They were taken from Jewish tradition.
Here's an example: Tell me if you recognize it. From the great Gamaliel:
"A person in whom there are good deeds and who has studied the Torah extensively, what is he like? A man who builds first [of] stones and then afterwards [of] mud bricks. Even if a large quantity of water were to collect beside the stones, it would not destroy them. But a person in whom there are no good deeds, though he has studied Torah, what is he like? A man who builds first [of] mud bricks and then afterwards [of] stones. Even if only a little water collects, it immediately undermines them."
RABBINIC PARABLES
Here's another:
The Broken Oath
Come (and) hear!
Valeria the proselyte asked Rabban Gamaliel (II):
--"Why is it written in your Torah:
--'He does not lift up (his) countenance..." (Deut 10:17c)
while it is written:
--'The LORD lift up his countenance upon you' (Num 6:26)?"
Joining in, Rabbi José the Priest said to her:
--"I'll give you a parable.
To what is this matter likened?
To a man who loaned his comrade [chaber] a hundred (shekels)
and fixed the due date in the presence of the king
and (the borrower) swore by the king's life (that he'd pay).
The due date arrived and he had not repaid (the lender).
He went to appease the king, who said to him:
--"I forgive you the insult to me.
It is for you to appease your comrade!"
So, too, the latter (text) concerns man's offences towards God [ha Maqom]
the former concerns man's offences towards his comrade."
--- Babylonian Talmud, Rosh HaShanah 17b
And Jesus instructed that the Jews should obey even the Pharisees. Why?
Matt 23 1 Then Jesus spoke to the multitudes and to his disciples, 2 Saying: The scribes and the Pharisees have sitten on the chair of Moses. 3 All things therefore whatsoever they shall say to you, observe and do: but according to their works do ye not; for they say, and do not.
Where did He get this teaching of "Moses Seat"?
From Rabbinic tradition.
And of course, Jesus also taught from Scripture.