Charles Spurgeon Commentary Daniel 1:17-19

"Now as for these four youths, God gave them knowledge and skill in all learning and wisdom: and Daniel had understanding in all visions and dreams. And at the end of the days which the king had appointed for bringing them in, the prince of the eunuchs brought them in before Nebuchadnezzar. And the king communed with them; and among them all was found none like Daniel, Hananiah, Mishael, and Azariah: therefore stood they before the king." — Daniel 1:17-19 (ASV)

And Daniel had understanding in all visions and dreams (Daniel 1:17).

Now at the end of the days that the king had said he should bring them in, then the prince of the eunuchs brought them in before Nebuchadnezzar. And the king communed with them; and among them all was found none like Daniel, Hananiah, Mishael, and Azariah: therefore stood they before the king (Daniel 1:18–19).

They were made to be his attendants, his advisers, these very men who had been so absurd as not to eat the food from the royal table, so obstinate as to consider that they would defile themselves if they did. It is these absurd and obstinate people who cannot be bent, but must be straight; the upright men, who shall stand before kings, for God is with them.