Dipl Ing Lars Behrendt, writing from the orthotics & prosthetics industry, reflects on Steve Jobs' line that 'about half of what separates the successful entrepreneurs from the non-successful ones is pure perseverance.' The post threads passion-driven persistence, setbacks as feedback, and long-term vision through hardship, citing Angela Duckworth's research on grit alongside Jobs' famous teenage cold call to Bill Hewlett. A reminder that grit usually outranks raw talent — for clinicians, founders, and patients alike.