We begin a new section of the sefer Nefesh Hachaim, and begin our discussion of prayer. We learn that prayer is to be done with all of one's heart and all of one's soul.

We see that the action of a commandment has the power to rectify, irrespective of its accompanying intentions. We therefore need to understand what advantage is gained in understanding what rectifications are accomplished by the mitzvah.

We explore how a sage, using the tools given over by tradition itself, can expound and expand upon the tradition.

A later prophet could not introduce new laws unless there was a root in the Torah itself, nor could he suspend a law, unless it was on a temporary basis.

Moshe's vision was on such an exalted plane that it would be impossible to ever contravert.

We discuss the difference between the Torah before it was given and after.

We discuss the mysterious concept of the keeping of the Torah before it was given.

Just as a mikvah has the power to purify, so too the torah completely purifies when approached with the correct intentions.

King David spoke of the Torah in a way that clearly echoes the concept of Teshuva as bringing down the supernal light.

We see that the special sacrifice Adam Harishon brought to atone for his sin brings out the very concept we have been discussing.