I am not the greatest practicioner of the medieval discipline of Lectio divina; I really only started a few weeks, and only sporadically. To get myself into the discipline, I’m reading Guigo II, Prior of La Grande Chartreuse, the motherhouse of the Carthusians in the late 1100s, Scala Claustralium — The Ladder of Monks. My Internet research says that he’s the first to clearly articulate the now-standard quartet of lectio, meditatio, oratio, and contemplatio.
He writes, at the end of chapter 2:
Lectio is the careful investigation of the Scriptures with the attention of the soul (animus). Meditatio is the zealous activity of the mind (mens), seeking out the knowledge of hidden truth by the leading of its own reason. Oratio is the devoted attention of the heart to God for the removal of evil or the acquisition of good things. Contemplatio is a certain elevation above itself of the mind suspended in God , tasting of the joys of eternal sweetness.