Hsin Hsin Ming (excerpt)

"The Great Way is not difficult for those who have no preferences. When (desire) and hate are both absent everything becomes clear and undisguised. Make the smallest distinction, however, and heaven and earth are set infinitely apart. If you wish to see the truth then hold no opinions for or against anything. To set up what you like against what you dislike is the disease of the mind."

Also, see the quote from David Hawkins below.