Catechism of the Catholic Church §2657 — excerpt
The Holy Spirit, who instructs us to celebrate the liturgy in expectation of Christ's return, teaches us - to pray in hope. Conversely, the prayer of the Church and personal prayer nourish hope in us.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.