To be in this world but not of this world.
Therefore, let us not sleep as others do; but let us watch, and be sober (1Thess5:6)
My child, said a priest to a young girl whom he blessed as she was about to enter the world after years of pious convent education; my child, you will find all through life, at almost every step, an angel of God, who will present himself to you under a thousand forms, offering you true happiness, but always asking something from you in return.
He is called the angel of sacrifice.
Do not refuse him what he will ask from you.
God has put into his hands immense treasures of pure joy, from which he will return a hundredfold all that you give him.
From you, who are still young, he will demand but little: a glance which would only serve to gratify your curiosity; an object of no real value, to which you are too strongly attached; a reading [or viewing] which might have fostered your self-indulgence; some word, some arrangement of your appearance, the only object of which is to please.
My child, do not deny him what he asks of you.
If you refuse him once, you will lose your strength to grant him later what he will grant imperiously.
You will hardly believe me, perhaps, but my experience is this: When we accustom ourselves to give, we become so infatuated with giving that we can never cease.
And whilst we are always giving, he gives also, and his are godly gifts, if we but learn it.
O my child! the more sacrifices we make on earth, the happier we become.
– From: Golden Grains, Eighth Edition, H.M. Gill and Son, Dublin, 1889 (headings in bold added)