Hope is specified by a book, by words, rather than by feelings. If you had the time, it would be an amazing exercise to go through the whole of Scripture just noting and counting the promises. There are well over three hundred of them, three hundred distinct promises, many of them repeated many times in different forms. Our God is thus a God of promises. And he keeps every one to the letter.
Promises come true.
The scriptural notion of truth is not, like the Greek notion, a timeless formula, something abstract and static. Rather, it is something that happens in history, it comes true. The Messiah is not an ideal but a person. Creation, fall, Incarnation, death, Resurrection, ascension, Second Coming these are not myths or images or meanings merely, but actual events. Yet, though hope is not vague, it is universal.