Be on familiar terms with the angels; often contemplate them invisibly present in your life, and above all love and venerate that angel who watches over the diocese to which you belong. Pray to the angels of the people with whom you live, and especially to your own guardian angel. Call on him often and praise him every day, imploring his help and support in all that you do, spiritual or temporal. The angels present your petitions before God. [cf. Tb 12:12]

– INT. Part II, Ch. 16; O. III, p. 105

Taken from the lovely blog of PhatCatholic.