In other words, the person mature enough to commit to either the married or religious state of life must already have become a free, self-possessed, unique masculine or feminine celibate — for that is precisely what caelebs means: singular and alone!
“If we wish to serve God and love our neighbor well, we must manifest our joy in the service we render to Him and them. Let us open wide our hearts. It is joy which invites us. Press forward and fear nothing.”