What should a student of knowledge begin with: learning the Qur'an or other sciences?

Question:
He says: Some people criticize certain students of knowledge who study books of 'aqidah (creed) and tawhid (the oneness of Allah), and ask them, "Why do you not study the Qur'an?" When I told him about the Prophet's (peace and blessings be upon him) statement to the Khawarij that they are , because their creed contradicts the Qur'an, he rejected my view and said, "One must learn the Qur'an first, and then the other sciences." Is what he says correct?

Answer:
And these people who read books of tawhid, have they not learned the Qur'an? Is there anyone here who reads a book from the books of knowledge without having previously read the Qur'an? But this is, in itself, a matter concerning the books of tawhid, because there are those who harbor hatred for the books of tawhid and say, "Call people to morals, to this, to that, but as for tawhid, it divides people. People have their creeds, and they are content with their creeds so that they may unite and not divide."