God gave these four young men knowledge and understanding in every kind of literature and wisdom. Daniel also understood visions and dreams of every kind.
References for Daniel 1:17
At the end of the time that the king had said to present them, the chief official presented them to Nebuchadnezzar.
The king interviewed them, and among all of them, no one was found equal to Daniel, Hananiah, Mishael, and Azariah. So they began to serve in the king's court.
In every matter of wisdom and understanding that the king consulted them about, he found them 10 times better than all the diviner-priests and mediums in his entire kingdom.
References for Daniel 1:20
Daniel remained there until the first year of King Cyrus.
References for Daniel 1:21