A Voice from the Past - Chesterton

Ideas are dangerous, but the man to whom they are least dangerous is the man of ideas. He is acquainted with ideas, and moves among them like a lion-tamer. Ideas are dangerous, but the man to to whom they are most dangerous is the man of no ideas. The man of no ideas will find the first idea fly to his head like wine to the head of a teetotaller.

G. K. Chesterton, 1874-1936, Heretics, Concluding Remarks on the Importance of Orthodoxy (Barnes & Noble Inc., 2007, p. 158)

Is the best way to avoid following ideas to an extreme a broad understanding of ideas? How do we acquire this?