Many people are naive. Contrary to anthropological, historical, and sociological information, they think that most people are naturally good, unselfish, and peaceful. However, our bubbles of naivete are repeatedly burst by sin, violence, divorce, addiction, terrorism, racism, war, etc.
Then the naive often turn to cynicism. They believe there is no hope for the world or themselves. Then they either give in to depression or try to escape from reality through overindulgence.
But there is hope in Jesus — only in Jesus. Jesus continues to come into the worst situations and raise the dead (see Lk 7:14-15). He is the Lord of history. Without Him we can do nothing (Jn 15:5). With Him nothing is impossible (see Mt 19:26).
Consequently, we Christians are the only people in the world who have reason to be hopeful. Thus, "should anyone ask you the reason for this hope of yours, be ever ready to reply" (1 Pt 3:15). "And this hope will not leave us disappointed, because the love of God has been poured out in our hearts through the Holy Spirit Who has been given to us" (Rm 5:5). The Lord promises: "I know well the plans I have in mind for you...plans for your welfare, not for woe! plans to give you a future full of hope" (Jer 29:11). "In hope we were saved" (Rm 8:24). "Rejoice in hope" (Rm 12:12).