Steve Ballmer, the famously energetic CEO of Microsoft, built his speech around three pillars: great ideas, passion, and tenacity. On tenacity, he preferred the word 'irrepressible' — tenacious but with optimism baked in. He pointed out that most companies started in tech fail, and even the ones that succeeded — Microsoft, Apple, Google, Facebook — all went through times of hardship. Passion gets you excited, but irrepressibility keeps you going when things get hard. He applied this beyond the tech industry, arguing it's a universal lesson whether you're going into science, medicine, business, or any other walk of life.