As one self-perfects (self-normalizes), the motivation to do evil diminishes, and the ease with which one does what is good increases.

presently, then, I felt the stiff insertion between the yielding, divided lips of the wound, now open for life; where the narrowness no longer put me to intolerable pain, and afforded my lover no more difficulty than what heighten'd his pleasure, in the strict embrace of that tender, warm sheath, round the instrument it was so delicately adjusted to

The 'twixt-brain is limited behind by the posterior commissure.

Her mind was vibrating with excitement.