II. Public services are of a higher character than private
But the respect that is paid to the Divine decrees always brings a special blessing, whatever may be the extent of our voluntary services, so that publicly proclaimed celebrations are of a higher character than those which rest on private institution. For the exercise of self-restraint, which each individual imposes on himself at his own discretion, concerns the benefit of a certain portion only of the Church, but the fast which the whole Church undergoes leaves out no one from the general purification, and God's people then become strongest, when the hearts of all the faithful meet together in one common act of holy obedience, when in the camp of the Christian army there is on all sides the same making ready for the fight and for defence. Though the cruel enemy rage in restless fury, and spread all round his hidden snares, yet he will be able to catch no one and wound no one, if he find no one off his guard, no one given up to sloth, no one inactive in works of piety.
Source: Sermons (New Advent)