This is true of those who educate and of those whom they bring up.

As the methods of modern warfare call for more individual resourcefulness, so do the methods of the spiritual warfare, now that we are not supported by big battalions, but each one is thrown back on conscience and personal responsibility.

Girls as well as boys have to be trained to take care of themselves and be responsible for themselves, and if they are not so trained, no one can now be responsible for them or protect them in spite of themselves.
Therefore, the first duty of those who are bringing up Catholic girls is to be themselves such as Catholic girls must be later on.
This example is a discourse "in the vulgar tongue" which cannot be misunderstood, and example is not resented unless it seems self-conscious and presented of set purpose.

The one thing necessary is to be that which we ought to be, and that is to say, in other words, that the fundamental virtue in teaching children is a great and resolute sincerity.

Sincerity is a difficult virtue to practise and is too easily taken for granted.