After the Opening Prayer of Mass, we sit for the Readings. We can sit at other times, if we are unable to stand or kneel, but we are asked to sit for the readings (except the Gospel) and for the homily.
As a posture, sitting allows for full attention to be focused on the teacher and the lesson, which is why students, generally speaking, sit at a desk to learn.
Followers of Jesus are called disciples, which comes from a Greek word, meaning one who learns. We often hear about disciples sitting at the feet of the Master to learn.
As Christians, the principle source of our learning comes from the Sacred Scriptures.
This is part of a series on how to worship at Holy Mass by Archbishop Jackels. The name comes from the "4 H's" of the 2nd Mission Priority: Enhancing the Sunday assembly for Holy Mass. This series was published between February and December of 2017.