Erech Apayim = Yesod = Shemiras Habris
Today, our Rebbe Reb Duvid Chaim, was discussing (on the phone conference) the Middos of Rachamim (Attributes of Mercy). The sixth attribute of the thirteen is "Erech Apayim", which refers to God's endless patience with us. It might be possible that Erech Apayim corresponds to the sixth of the Seven Middos through which God runs the world (Chesed, Gevurah, Tiferes etc), which is Yesod. Yesod refers to shmiras habris, moral purity, which is our addiction. This teaches us that Hashem's patience is especially applicable to those of us who are engaged in working on Midas Hayesod, the struggle to establish and solidify the foundations of our lives and our Yiddishkeit. He knows how difficult it is and has all the patience in the world (after all, He created patience!) as he waits for us to get it right by fully turning to Him and "letting go and letting God".