Your strongest competitor knows every excuse because they live in the same head.

The voice that talks you out of things has complete access to your history, your fears, and every excuse that has ever worked on you. It is not a stranger you can outmanoeuvre. It knows the argument you will accept and offers exactly that one, framed as reasonable.

When a reason to stop arrives feeling especially sensible, treat that quality as suspicious rather than confirming. Ask whether you would accept the same reasoning from someone else. The answer is usually informative.