Who Should Study Torah? How Does Ritual Purity Impact One's Experience and Merit in the Study of Torah?

It is a law that every human being should study Torah.  The conditions that fall upon one's status regrading taharah (purity) and tum'ah (impurity) will have an impact on one's experience and merit in the study of Torah. When expanded, this idea leads to the secrets of the indwelling of Shekhinah, so one is advised to gain a practical understanding of the Order of Purities (i.e. the Sixth Order of the Mishnah).