Why is "Brotherly Love, Relief, and Truth" so important in Freemasonry?

These three virtues, "Brotherly Love, Relief, and Truth", are the foundations upon which Freemasonry is built.

Brotherly love, as directed towards all mankind, especially to other Masons. Relief, in that every Mason is obligated to relieve the suffering of any Master Mason they encounter who is in dire need and if in their power to do so, to the best of their ability, also to act charitably towards society, giving of ourselves economically, physically, and mentally. And truth, which is represented by the Divine, in its multiplicity and diversity as understood by all men.