All relationships change the brain - but most important are the intimate bonds that foster or fail us, altering the delicate circuits that shape memories, emotions and that ultimate souvenir, the self.

Who would deduce the dragonfly from the larva, the iris from the bud, the lawyer from the infant? ...We are all shape-shifters and magical reinventors. Life is really a plural noun, a caravan of selves.

Habitats keep evolving new pageants of species, and we shouldn't interfere.

What an odd, ruminating, noisy, self-interrupting conversation we conduct with ourselves from birth to death.

I believe consciousness is brazenly physical, a raucous mirage the brain creates to help us survive.

As anyone who has received or dispensed psychotherapy knows, it's a profession whose mainspring is love. Nearly everyone who visits a therapist has a love disorder of one sort or another, and each has a story to tell - of love lost or denied, love twisted or betrayed, love perverted or shackled to violence. Broken attachments litter the office floors like pick-up sticks. People appear with frayed seams and spilling pockets.

When I go biking, I repeat a mantra of the day's sensations: bright sun, blue sky, warm breeze, blue jay's call, ice melting and so on. This helps me transcend the traffic, ignore the clamorings of work, leave all the mind theaters behind and focus on nature instead. I still must abide by the rules of the road, of biking, of gravity. But I am mentally far away from civilization. The world is breaking someone else's heart.