13 It is rather ignorance than ill-will which keeps multitudes away from Jesus Christ. There are many who study humanity and the natural world; few who study the Son of God. The first step, then, is to substitute knowledge for ignorance, so that He may no longer be despised or rejected because He is unknown. We conjure all Christians throughout the world to strive all they can to know their Redeemer as He really is. The more one contemplates Him with sincere and unprejudiced mind, the clearer does it become that there can be nothing more salutary than His law, more divine than His teaching. In this work, your influence, Venerable Brethren, and the zeal and earnestness of the entire Clergy, can do wonders. You must look upon it as a chief part of your duty to engrave upon the minds of your people the true knowledge, the very likeness of Jesus Christ; to illustrate His charity, His mercies, His teaching, by your writings and your words, in schools, in Universities, from the pulpit; wherever opportunity is offered you. The world has heard enough of the so-called "rights of man." Let it hear something of the rights of God. That the time is suitable is proved by the very general revival of religious feeling already referred to, and especially that devotion towards Our Saviour of which there are so many indications, and which, please God, we shall hand on to the New Century as a pledge of happier times to come. But as this consummation cannot be hoped for except by the aid of divine grace, let us strive in prayer, with united heart and voice, to incline Almighty God unto mercy, that He would not suffer those to perish whom He had redeemed by His Blood. May He look down in mercy upon this world, which has indeed sinned much, but which has also suffered much in expiation! And, embracing in His loving-kindness all races and classes of mankind, may He remember His own words: "I, if I be lifted up from the earth, will draw all things to Myself' (John XII., 32).
Source: Tametsi Futura Prospicientibus (Vatican.va)