we can still hear his voice bellowing through the Senate chamber, face reddened, fist pounding the podium, a veritable force of nature, in support of health care or workers' rights or civil rights. And yet, while his causes became deeply personal, his disagreements never did. While he was seen by his fiercest critics as a partisan lightning rod, that is not the prism through which Ted Kennedy saw the world, nor was it the prism through which his colleagues saw him. He was a product of an age when the joy and nobility of politics prevented differences of party and philosophy from becoming barriers to cooperation and mutual respect-a time when adversaries still saw each other as patriots.

what is the content and purpose of this sentence ? ​