Sharpen the Saw: the renewal habit

The second dimension. Reading, studying, learning, writing, planning. Cal Newport's Deep Work (2016) names the operating tool: distraction-free concentration on a cognitively demanding task. A man with no deep work in his week atrophies mentally even when he's busy. Anders Ericsson's deliberate-practice research adds the harder claim: passive reading isn't enough; effortful study (testing yourself, getting feedback, working past comfort) is what builds skill.