The acts of that learned man are well-conceived, and well-applied who formeth matrimonial alliances with persons of equal position and not with those that are inferior, who placeth those before him that are more qualified, and who talketh, behaveth and maketh friendships with persons of equal position.

In plain words: Vidura says a wise person acts well when he arranges marriages with families of equal standing, puts more capable people ahead of himself, and talks, behaves, and makes friends with his equals.