Final answer:
The text explains why we are reluctant to trust ourselves due to our preconceived notions and expectations.
Step-by-step explanation:
The text that explains why we are reluctant to trust ourselves can be found in line 39-51. The text states, "Most commonly we come to books with blurred and divided minds, asking of fiction that it shall be true, of poetry that it shall be false, of biography that it shall be flattering, of history that it shall enforce our own prejudices." This highlights how our preconceived notions and expectations shape our trust in the information we consume.