Tell me what you pay attention to and I will tell you who you are.
Ortega challenges us to see attention not as a neutral faculty, but as a moral and existential choice—what we focus on actively constructs our values, not the reverse. Most people assume their character is fixed and then their interests follow, but he inverts this: we become whoever our habits of concentration have made us. A person scrolling social media for validation is literally building themselves into someone dependent on external approval, moment by moment, while someone who reads difficult philosophy is forging different neural pathways and assumptions about what matters. The radical part is accepting that there's no escape into "true self"—only the accumulating weight of a thousand small decisions about where to aim your mind.