From YOUCAT, fact 308:
308: What is hope?
Hope is the power by which we firmly and constantly long for what we were placed on earth to do: to praise God and to serve him; and for our true happiness, which is finding our fulfillment in God; and for our final home: in God.
Hope is trusting in what God has promised us in creation, in the prophets, but especially in Jesus Christ, even though we do not yet see it. God’s Holy Spirit is given to us so that we can patiently hope for the Truth.