That a free laborer is a mobile laborer, especially in a society like the United States that had this thing called The West, the limitless apparently to them anyway--boundless West.

自由劳动者是流动的,尤其处在美国这样的社会,有他们所说的广袤的西部,特别对他们来说,无边际的西部

耶鲁公开课 - 美国内战与重建课程节选

But we are, as ever, a people of endless compassion, boundless ingenuity, limitless strength.

WHITEHOUSE: President Obama Pardons White House Turkey

We may not have a silver bullet, but we do have in this country limitless sources of energy, a boundless supply of ingenuity, huge imagination, amazing young people like you -- (applause) -- all of which can put -- all of which we can put to work to develop this new energy source.

WHITEHOUSE: President Obama at the University of Miami