undigesting

You first taught me that the doctrine was a live thing, and not a mere formula to be swallowed by the undigesting reason, and from the time that I learnt from you that a Father meant a real Father, a Son a real Son, and a Holy Spirit a real Spirit, who was really good and holy.

During sleep, normal digestion is delayed or arrested altogether; and the sleeplessness may be directly ascribed in these cases to the presence of undigesting food, which is often indigestible and usually acid.