Anyone who habitually sabotages their own plans is one's own worst enemy.

After missing several chances because of self-doubt, one realized one was one's own worst enemy.

To sell one's own grandmother to get ahead shows how unprincipled someone can be.

The boutique bakery expanded so quickly that, overwhelmed by orders and understaffed, it became a victim of one's own success.

In those days, one kept one's own counsel to avoid trouble.

One keeps one's own counsel in difficult negotiations to maintain an advantage.

Keeping one's own counsel, the manager listened to both sides before making a decision.

In creative workshops, doing one's own thing often leads to unique results.

One does one's own thing even when others expect conformity.

In college, one did one's own thing, even when that meant skipping class to pursue art.