simple vow

It might help if all public actors, from leaders and investigators to journalists and voters, made a simple vow to make it a little better, not a little worse.

For all of his rhetorical fireworks, he has driven home his simple vow to “make America great again.”

And the murmur lasted longer than a simple vow would have.

But now he had ended his relationship with the former tennis world number one, he made the simple vow to immerse himself in his golf.

Mr. Obama has repeated a seemingly simple vow: On his watch, the United States would do whatever it takes to “prevent Iran from obtaining a nuclear weapon.”