Take heed that ye do not your alms before men, to be seen of them: otherwise ye have no reward of your Father which is in heaven. Therefore when thou doest thine alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, They have their reward.
I have to take issue with Pope Leo (and the author) on one small point, though:
...it is proper that the individual and the family should be permitted to retain their freedom of action, so far as this is possible without jeopardizing the common good.
Christ said, "What therefore God hath joined together, let not man put asunder." He did not say, "except where it suits the common good." There can be no exceptions: secular government must be excluded from the construct of the family and from the enforcement of charity. Any other condition is non-Christian and immoral.
I think you're right about the "common good" point, except in the most general sense, since individuals' or families' "freedom of action" has to constrained by general laws against murder, theft, assault, etc.