20 In the fulfillment of this, Our duty, we shall not let Ourselves be influenced by earthly considerations nor be held back by mistrust or opposition, by rebuffs or lack of appreciation of Our words, nor yet by fear of misconceptions and misinterpretations. We shall fulfill Our duty, animated ever with that paternal charity which, while it suffers from the evils which afflict Our children, at the same time points out to them the remedy; We shall strive to imitate the Divine Model of shepherds, Jesus, the Good Shepherd, Who is light as well as love: "Doing the truth in charity" ( Ephesians iv. 15).
Source: Summi Pontificatus (Vatican.va)