Daniel 1:3-5 (NLT)
Then the king ordered Ashpenaz, his chief of staff, to bring to the palace some of the young men of Judah’s royal family and other noble families, who had been brought to Babylon as captives. ⁴ “Select only strong, healthy, and good-looking young men,” he said. “Make sure they are well versed in every branch of learning, are gifted with knowledge and good judgment, and are suited to serve in the royal palace. Train these young men in the language and literature of Babylon.” ⁵ The king assigned them a daily ration of food and wine from his own kitchens. They were to be trained for three years, and then they would enter the royal service. 

Daniel 1:8 (NLT)
But Daniel was determined not to defile himself by eating the food and wine given to them by the king. He asked the chief of staff for permission not to eat these unacceptable foods.  

Daniel 1:15-20 (NLT)
At the end of the ten days, Daniel and his three friends looked healthier and better nourished than the young men who had been eating the food assigned by the king. ¹⁶ So after that, the attendant fed them only vegetables instead of the food and wine provided for the others. ¹⁷ God gave these four young men an unusual aptitude for understanding every aspect of literature and wisdom. And God gave Daniel the special ability to interpret the meanings of visions and dreams. ¹⁸ When the training period ordered by the king was completed, the chief of staff brought all the young men to King Nebuchadnezzar. ¹⁹ The king talked with them, and no one impressed him as much as Daniel, Hananiah, Mishael, and Azariah. So they entered the royal service. ²⁰ Whenever the king consulted them in any matter requiring wisdom and balanced judgment, he found them ten times more capable than any of the magicians and enchanters in his entire kingdom.

Psalm 90:12 (NIV)
Teach us to number our days, that we may gain a heart of wisdom.

Daniel 2:30 (NLT)
And it is not because I am wiser than anyone else that I know the secret of your dream, but because God wants you to understand what was in your heart.