Brotherhood means duty. One who shuns duty shuns Brotherhood. Ignoring assignments, failing to do one's share, is not being brotherly. A Brother's duty is to uphold the principles and policies of this Fraternity into which he voluntarily accepted membership and which extended him the privilege of becoming a Candidate, and hopefully a Brother. Fulfilling one's duty is fulfilling the vows of Brotherhood.
Brotherhood means cooperation.
Being uncooperative is being unbrotherly. Cooperation doesn't come easy to the self-centered and apathetic. They do not belong in Sigma Nu. Cooperation is the very fuel that sparks the Brotherhood toward success. The greater the degree of cooperation among Brothers and Candidates, jointly and severally, the closer the Brotherhood, hence the better the Chapter.