The Catechism in Questions & Answers

269. How can this blessing be attained and how should it be treated?

Many divine blessings are made accessible to the believers in the divine service. Sacrifice also brings blessing—this is the fundamental experience of the Christian.
Human beings are called upon to pray for the blessing of God and to conduct themselves in such a manner as to show themselves worthy of this blessing. Believers demonstrate their gratitude for the blessing of God through a life defined by the fear of God, obedience, and faith.

Sacrifice and blessing: see Question 738.