Let him, O Dhritarashtra, rule the earth, to the exclusion of all thy sons. Yudhishthira is the foremost of all thy heirs. Endued with energy and wisdom, and acquainted with the truths of religion and profit, Yudhishthira, that foremost of righteous men, hath, O king of kings, suffered much misery out of kindness and sympathy, in order to preserve thy reputation.

In plain words: Vidura urges Dhritarashtra to let Yudhishthira rule instead of his own sons, because Yudhishthira is the best heir, wise and righteous. He points out that Yudhishthira has endured much suffering out of kindness, to protect the king's good name.