Man's good is threefold. There is first his soul's good which is offered to God in a certain inward sacrifice by devotion, prayer and other like interior acts
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic sacrifice prayer
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/18755/pg18755-images.html

Context

“The very fact that we wish to cling to God in a spiritual fellowship pertains to reverence for God: and consequently the act of any virtue assumes the character of a sacrifice through being done in order that we may cling to God in holy fellowship. Reply Obj. 2: Man's good is threefold. There is first his soul's good which is offered to God in a certain inward sacrifice by devotion, prayer and other like interior acts: and this is the principal sacrifice. The second is his body's good, which is, so to speak, offered to God in martyrdom, and abstinence or continency. The third is the good which consists of external things:” source