Protect momentum from distractions disguised as opportunities.

The dangerous interruptions are not the obvious ones. They are the genuinely good possibilities that arrive while something is finally working, and they are hard to decline because they are real. Taking them scatters what you had going, and you can spend years collecting promising beginnings without finishing anything.

When a new opportunity appears, ask whether it is better than what you are already doing or merely newer. If you cannot say clearly that it is better, note it down and let it wait. Most good things are still there in six months.