Sam seems so wise, even for somebody so young! Everything he writes is a pleasure to read. Calm, considered, sometimes controversial, but always worth digesting.
This is a good list, worth reading and talking about it; but for me wisdom means non-trivial, sometimes contraintuitive deep insight. Wisdom needs intelligence, experience and perspective (that mostly equals age). If you take any of these three out then it's usually not wisdom.
Or maybe I'm totally wrong because I definitely lack the age :)