This is not the case with purity from the impurity, for the impurity is the immorality of morals, and it is reasonable in meaning, for it is cleanliness. Purity from the impurities is the purification of good morals and the removal of their immorality from the souls, so it is the purity of the souls, whether you intend it to worship or not. If you intend worship, then virtue upon virtue, and light upon light, and if not. You mean virtue and nothing else, for good morals are required for their own sake, and their highest status is to use them as an act of worship by purifying them from impurities and removing impurities from souls, which we said is morality. What is obligatory for us is that it is a condition for the validity of worship, for God has made it an independent act of worship required for its own sake, so it is, like all other obligatory duties, obligatory with remembrance and void with forgetfulness. Whenever you remember it, it is obligatory like the obligatory prayer.