Every Christian--as he explores the historical record of Scripture and tradition and comes to a deep, abiding faith--experiences that Christ is the risen one and that he is therefore the eternally living one. It is a deep, life-changing experience. No true Christian can keep it hidden as a personal matter. For such an encounter with the living God cries out to be shared--like the light that shines, like the yeast that leavens the whole mass of dough.
The true Christian is a living gospel. That does not mean he is a disciple of a doctrine that is far away in time and foreign to the reality of life. He does not repeat powerless formulas. No, he is convinced and tenacious in asserting the relevance of Christ and the unceasing newness of the gospel. He is always eager before anyone and at any time to give reason for the hope which he harbors in his heart (see 1 Peter 3:15).
--Blessed John Paul II