28 But there is comfort for us: the Lord liveth and "He will make all things work together unto good to them that love God" ( Rom. viii. 28). Even from these evils He will bring good, and above all the obstacles devised by human perversity He will make more splendid the triumph of His work and of His Church. Such is the wonderful design of the Divine Wisdom and such "His unsearchable ways" ( Ib . xi. 33) in the present order of Providence - "for my thoughts are not your thoughts, nor my ways your ways, said the Lord" ( Isai . Iv. 8) - that the Church of Christ is destined ever to renew in herself the life of her Divine Founder who suffered so much, and in a manner to "fill up what is wanting of the sufferings of Christ" ( Coloss . i. 24). Hence her condition as militant on earth divinely constrains her to live in the midst of contentions, troubles, and difficulties, that thus "through many tribulations she may enter into the kingdom of God" ( Act . xiv. 21), and at last be united with the Church triumphant in heaven.
Source: Communium Rerum (Vatican.va)