beaten highway


I am reading "The varieties of religious experience" book.

I found the following phrase:

"The documents humains which we shall find most instructive need not then be sought for in the haunts of special erudition -they lie along the beaten highway; and this circunstance, which flows so naturally from the character of our problem, suits admirably also your lecturer's lack of special theological learning".

Can somebody help me please with the meaning of "beaten highway" in this context?

Thank you!
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