The motive, principle, and end of the religious life is to make an absolute gift of self to God in a self-forgetting love, to end one's own life in order to make room for God's life.
As for what concerns our relations with our fellow men, the anguish in our neighbor's soul must break all precept. All that we do is a means to an end, but love is an end in itself, because God is love.
On the question of relating to our fellowman - our neighbor's spiritual need transcends every commandment. Everything else we do is a means to an end. But love is an end already, since God is love.