True hope is not wishful thinking. Hope is a product of faith in God. The first verse of Hebrews chapter eleven elaborates that faith is the substance of things hoped for, the evidence of things unseen. Scripture also records that Jesus is our hope of glory. All these eternal things are not ethereal concepts, but substances of the nature of God personified in Christ. Hope, faith, love, truth, life all of these are in Christ.
When I say these things are in Christ, substance of His substance, I am not referring to wishing, blind acceptance when there is no evidence, emotions of romance or affection, doctrines, or biology. I am talking about eternal substantial hope, faith, love, truth, and life. I am talking about them in their true form. A form that is available for us to experience tangibly in Christ.
We do this when we encounter Him. Each encounter with Him reproduces what He is eternally into us. Thus, we have hope because we connect with His substantive reality of being. Our hope is not wishful thinking, but something so real it resonates within us and awakens us to the eternal reality.
Christians believe with such tenacity because we have been made alive on the inside and our inner man knows the reality of that which we profess.