The most successful venture investors share two key traits: they originate investments from a first-principles or contrarian standpoint, and they possess the conviction to concentrate significant capital into their winning portfolio companies as they emerge.

To write a billion-dollar check, a firm needs "dogmatic conviction." Thrive Capital achieves this through extremely long diligence and relationship-building periods, often spanning years. This deep familiarity, like their 10-year relationship with Stripe before a major investment, is the foundation for making huge, concentrated bets.

Undiversified founders can't afford a VC's portfolio mindset. Instead of pursuing ideas that *could* work, they must adopt strategies that would be *weird if they didn't work*. This shifts focus from optimizing for a chance of success to minimizing the chance of absolute failure.

Successful concentration isn't just about doubling down on winners. It's equally about avoiding the dispersion of capital and attention. This means resisting the industry bias to automatically do a pro-rata investment in a company just because another VC offered a higher valuation.

When meeting Cursor's founder, the investor felt an "electric energy" even as the founder was pivoting away from his original idea. This highlights that for elite early-stage investors, the founder's intrinsic drive and potential are the constant to bet on, as ideas will inevitably change.

The dominant VC narrative demands founders focus on a single venture. However, successful entrepreneurs demonstrate that running multiple projects—a portfolio approach mirrored by VCs themselves—is a viable path, contrary to the "focus on one thing" dogma.

Thrive's late-stage philosophy starts with qualitative conviction in the team and product. Quantitative analysis is used to confirm this hypothesis, not generate it. This approach builds resilience against short-term metric fluctuations that cause purely quantitative investors to lose confidence, allowing for bolder, long-term bets.