Thomas Mueller-Borja attributes his success in difficult situations to a core, almost "delusional" belief that he can do anything. This optimistic mindset is essential for taking risks and coping with uncertainty, but it must be paired with a practical team that can translate vision into execution.

People who consistently struggle automatically dismiss new opportunities with a "nah" mindset. Successful individuals adopt a "maybe skewing towards yes" approach. This isn't blind optimism but a practical pondering strategy that opens doors to life-changing possibilities.

The conviction that you can achieve something is what enables the actions that create proof. Waiting for external validation first is a common fear response that leads to inaction and downward spirals. You must decide you can before the evidence exists.

A founder must simultaneously project unwavering confidence to rally teams and investors, while privately remaining open to any evidence that they are completely wrong. This conflicting mindset is essential for navigating the uncertainty of building a startup.

Significant career advancements often stem from changes in self-perception and belief. Adopting a mindset where you believe you belong at the next level and can own your value changes how you act and how others perceive you, creating opportunities that skills alone cannot.

Solving truly hard problems requires a form of 'arrogance'—an unwavering belief that a solution is possible, even after months or years of failure. This 'can-do' spirit acts as an accelerator, providing the persistence needed to push through challenges where most would give up.

Before convincing investors or employees, founders need irrational self-belief. The first and most important person you must sell on your vision is yourself. Your conviction is the foundation for everything that follows.

Regularly stating affirmations acts as a mental filter, making you more attuned to opportunities that align with your stated goals. This 'law of assumption' transforms mindset into tangible action by changing how you perceive and react to potential projects and connections.

Do not wait to feel confident before you start a new venture. Confidence isn't something you find; it's something you build through the repetitive act of showing up and doing the work, even when you're terrified. It is a result of consistent courage, not a cause of it.