In the Word Study: Catechism

catechism (n.)
c. 1500, “instruction in Christian principles,” also “elementary question-and-answer book of religious instruction,” from French catéchisme (14c.) and directly from Church Latin catechismus “book of instruction,” from Greek katekhismos, from katekhizein “to teach orally” (see catechize). Related: Catechismal.

via Online Etymology Dictionary

Luke 1:1-4

Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us, Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word; It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus, That thou might know the certainty of those things, wherein thou hast been instructed.

#Catechism #Certainty

A catechism ( /ˈkætəˌkizəm/; from Greek: κατηχέω, “to teach orally”), is a summary or exposition of doctrine and serves as a learning introduction to the Sacraments traditionally used in catechesis, or Christian religious teaching of children and adult converts