Other, more basic motivations drove him to act.

Mr. Cohen said: "The only motivation driving this action today was our absolute obligation to protect the American people from terrorist activities.

Knowledge, taken up to excess without hunger, even in opposition to any need, now works no longer as something which reorganizes, a motivation driving outwards.

More pragmatic motivations, like the expense of large amounts of university's network bandwidth being absorbed by students' proclivity for online entertainment, are also driving the renewed university efforts.

He did not bother to answer, instead insisting, "The only motivation driving this action today was our absolute obligation to protect the American people from terrorist activities."

The same motivation has driven many teams, including the Nets, to build eye-popping, private practice facilities.

Two complementary motivations drive instrumental learning: the maximization of positive outcomes and minimization of aversive ones.

But whatever motivation drove him to action, Clive Lodge is determined to make a go of the North American arm of the Professional Gardeners' Guild.

Hunt asserted that it is difficult to understand what motivation could drive Jason to continue working for Number 18's freedom even when the personal cost mounts and the likelihood of success seems non-existent.

Picard doubted that he would ever know exactly what motivations had driven Captain Lucius Aelius Sejanus.