The ancients were afraid that if they went to the end of the earth they would fall off and be consumed by dragons. But once we understand that Christianity is true to what is there, true to the ultimate environment - the infinite, personal God who is really there - then our minds are freed. We can pursue any question and can be sure that we will not fall off the end of the earth.

The Complete Works of Francis A. Schaeffer: A Christian view of the Bible as truth (ed. 1982)