Twenty years ago, the official diagnostic manual of the American Psychiatric Association classified homosexuality as a treatable neurotic disturbance. The most recent editions of that same work make no such claim. Needless to say, brain function has undergone no such variation; nor have the associated emotions; nor have the associated desires; nor has the associated behavior. Instead, the passage of time has hosted fundamental alterations in perspective.
— Daniel Robinson, from The Soul Hypothesis, p. 63