Prayer is the breath of the soul.
Our breathing is a constant source of renewal to our bodies. We eat three or four times a day. But we breathe all day long, all night too.
As impossible as it is for us to take a breath in the morning large enough to last us until noon, so impossible is it to pray in the morning in such a way as to last us until noon. Therefore, too, the apostle says, “Pray without ceasing” (1 Thessalonians 5:17). Let your prayers ascend to Him constantly, audibly or silently, as circumstances throughout the day permit.
—O. Hallesby, Prayer (pp. 147–148)