Rule 68

“Of all the parts of a school curriculum Religious Instruction is by far the most important, as its subject-matter, God’s honour and service, includes the proper use of all man’s faculties, and affords the most powerful inducements to their proper use. Religious Instruction is, therefore, a fundamental part of the school course, and a religious spirit should inform and vivify the whole work of the school.

The teacher should constantly inculcate the practice of charity, justice, truth, purity, patience, temperance, obedience to lawful authority, and all the other moral virtues. In this way he will fulfil the primary duty of an educator, the moulding to perfect form of his pupils’ character, habituating them to observe, in their relations with God and with their neighbour, the laws which God, both directly through the dictates of natural reason and through Revelation, and indirectly through the ordinance of lawful authority, imposes on mankind.”

See the full set of rules here.
Apparently these rules are under review.

Hmmmm . . . .