Nothing is driving him except his original impetus to survive.

The original impetus for these may have come less from the hot Virginia climate than from the landscape.

The original impetus for nuclear power, of course, was military.

The original impetus was the need to provide London with a modern sewerage system.

Australian government policy from earlier years has been claimed to be the original impetus for the apartheid system in South Africa.

As time went on the original impetus of these movements weakened.

The league's original impetus was to provide local recreational opportunities.

The original impetus was to use the labor force inside a shelter during inclement weather.

"I did provide the original impetus," Merlin said in response.

By the early afternoon he was beginning to feel tired and some of his original impetus had flagged.