The Stoic philosopher Epictetus drew a hard line between what is 'up to us' (our judgments, intentions, responses) and what is not (market conditions, user behavior, stakeholder decisions). For product managers, this dichotomy is operationally clarifying: your roadmap priorities, the clarity of your discovery process, how you frame tradeoffs — these are yours. Whether the market adopts your feature, whether leadership approves your budget, whether competitors move first — these are not. The trap most PMs fall into is inverting this: obsessing over outcomes they can't control while under-investing in inputs they actually own. Epictetus called this the primary cause of human frustration. It's also, arguably, the primary cause of roadmap chaos.

Which item on your current roadmap are you treating as a commitment when it's actually a bet — and does your team know the difference?

Drawing from Stoicism — Epictetus (Enchiridion, ~135 CE)