Earlier quoted context omitted.
I don't know, I thought he explained it pretty well: during meditation, you practice resisting urges. I'll admit that falls rather short of a doubleblindrandomlyassignedcontrolgrouplargesamplesizepeerreviewed study, but it does seem to be common sense that practicing something would make you better at it.
"during meditation, you practice resisting urges." Saying this does not make it true thought. Is that actually what people do during meditation? The only experience I have with meditation is sitting in seiza position after 2 hours of Ki Aikido, slowly feeling my muscles cramp, listening to someone hit a drum periodically, and not feeling anything good at all. Eventually I just learned to devote that time to reviewing…
The basic process goes something like:
1) Sit down in a comfortable position that you can stay in without moving.
2) Take deep breaths through your nose and focus your attention on the sensation of air moving over your nasal passages and into/out of your lungs.
3) When other thoughts come into your head or you find yourself thinking about anything other than your breathing, gently direct your attention back to your breathing.