Doctor Cornelius said, " Dear Prince, you must leave this castle at once and go to seek your fortune in the wide world. Your life is in danger here."

“亲爱的王子，你必须立刻离开这个城堡，到广大的世界里去寻求成功。在这里你会有生命危险。”

That expression " to seek (seek) your fortune (fortune)" means to try to become rich, to try to get a lot of money.

“to seek (seek) your fortune (fortune)” 这个表达的意思是试图变得富有，试图得到很多钱。