We see here a 'constructive skepticist' response to the Skeptics who say no knowledge is possible and to those ancient and latter-day 'dogmatic' thinkers (including, in his view, the Aristotelians and Descartes) who say knowledge involves the attainment of certain belief and is readily attainable.
It is equally clear: evolution is definitely preferable if it is attainable.
Many prospective candidates spend several elections in unsuccessful seats until they are given the nod for something attainable.
Harvey says it's all about "sending signals to our leaders" that emission cuts are attainable and worth pursuing.
What had begun, with Graham Dilley, as glorious mayhem - no more than do-or-die heroics - was now making a draw attainable by England, given some rain; he was even making victory conceivable.
If the policy was attainable, Cable said, "enormous damage would be done, notably through overseas students, which is one of the biggest components, actually.
It pointed ahead to a life in which furtive sex and fleeting assignations might be attainable, but the enduring security and companionship of marriage would be forever out of reach.
They may imagine that something like Northern Ireland's Good Friday agreement might one day be attainable in Kashmir.If so, it would take much more than a change of heart by one leader.
He will emerge from this process with new credibility and a trust in his ability to choose attainable goals.
Yossi Sarid, leader of the opposition Meretz Party, says complete quiet is attainable "only in graveyards, and we've got too many of those".
If Americans were to work longer, they could set a financial goal that is attainable rather than forbiddingly distant.
