A blessing is a pronouncement or invocation of divine favour upon a person, place, object or undertaking, and the act of conferring it is among the most widespread of all religious practices. To bless is to call down or declare God's goodness and protection, and in many traditions the words of blessing are held to carry a real efficacy, not merely to express a wish but to convey the favour they name. The practice runs through the biblical traditions from their beginning: God blesses creation and the patriarchs; the patriarchs bless their children, the blessing of the firstborn being a coveted and irreversible bestowal; and the priests of Israel are commanded to bless the people with the ancient words invoking God's keeping, grace and peace, in the formula still used in Jewish and Christian worship.
In Christian practice blessings are pronounced by clergy and by laypeople in countless settings, over meals, over the sick, at partings, over homes, marriages, tools and harvests, and at the close of worship in the benediction that sends the congregation out under God's favour. The Roman Catholic and Orthodox churches maintain a rich tradition of blessings for nearly every circumstance of life, distinguishing the blessing of persons and things from the sacraments proper. Parallel practices pervade the other religions: the Islamic invocation of God's peace and blessing, the blessings of Jewish daily life that hallow food, occasions and natural wonders, and the blessings bestowed by holy persons across many traditions. Underlying them all is the conviction that the good of life comes from a divine source and may be called down upon those and that which one holds dear.