The Four Agreements by Don Miguel Ruiz and Janet Mills

Four rules. Sounds simple. It is. And that's the point.

Don Miguel Ruiz draws on Toltec wisdom to lay out four agreements that, if you actually follow them, cut through most of the noise in your head.

Be impeccable with your word. Words create reality. Stop the gossip. Stop the negative self-talk. Say what you mean. Mean what you say. I underestimated this one until I started paying attention to how casually I spoke about myself and others.

Don't take anything personally. What people say and do reflects their world, not yours. This one is hard. I still catch myself reacting to criticism as if it's about my identity rather than my work. But when I remember this agreement, I bounce back faster.

Don't make assumptions. Ask. Communicate. Stop filling in blanks with worst-case stories. As an engineer, I've watched entire projects go sideways because someone assumed requirements instead of asking. This agreement applies everywhere.

Always do your best. Your best changes day to day. That's fine. The point isn't perfection. It's effort without self-judgment. This framing helped me let go of the guilt that comes with imperfect output.

Where I push back: Ruiz presents these ideas with a spiritual certainty that doesn't leave much room for nuance. The Toltec framing adds depth for some readers and friction for others. And the book sometimes repeats itself more than necessary.

But the core ideas are genuinely useful. I come back to these four agreements more than I expected. They're the kind of simple truths that are easy to understand and hard to live.

Short book. Worth your time. Especially if you tend to overthink.