This is the fundamental principle.

When a man really loves a human being, or an idea of his own mind, his secret thoughts are ever clinging to his love, while he is attending to the many various occupations of his life, be it the life of a servant, or the life of a king; and this does not prevent his attending carefully to his work, for he has no need to speak many words to his love.

Men who are of the world may carry thus in their hearts some human being, some ideal of truth, or of beauty.

Do you always carry in your breasts the Father whom you have not seen, but whom you have felt as a Spirit of love, breathing within you; a Spirit which filled you with the sweetest desire to live for Him.

If you will do this your labours will be all alive with the spirit of Truth." He rested a moment, and looked with a smile, at Don Clemente, seated beside the bed.
"Your words, spoken at dear Santa Scolastica," he said, and continued: "Be pure in your lives, for otherwise you will dishonour Christ before the world.