Rambam Siyum

(12) It is obviously clear that the laws concerning defilements and purities are biblical decrees, and not things which the human mind can determine; they are classified as divine statutes. So too, immersion as a means of ridding oneself from defilement is included among the divine statutes. Defilement is not mud or filth to be removed with water, but is a matter of biblical decree; it depends on the heart's intent. Accordingly, the sages have declared: If a man immersed himself, but without a definite purpose in view, it is as though he had not immersed himself at all. Nevertheless, there is some ethical allusion to this: just as one who sets his mind on becoming clean becomes clean as soon as he has immersed himself, even though nothing new is produced in his physical being, so one who sets his mind on purifying himself from all the spiritual defilements, namely wrongful thoughts and evil traits, becomes clean as soon as he made up his mind to abstain from those notions, and brought his soul into the waters of reason. Indeed, Scripture declares: "I will pour clean water over you, and you shall be clean; from all your impurities and idolatries I will cleanse you" (Ezekiel 36:25).

(5) At that time there will be no famines and no wars, no envy and no competition. For the Good will be very pervasive¹⁴⁸Or, inspiring, affecting, influencing.. All the delicacies will be as readily available as is dust. The world will only be engaged in knowing G-d¹⁴⁹Compare with Rabbi S. R. Hirsch in his Nineteen Letters.. Then, there will be very wise people¹⁵⁰Some editions have, “Israel will be very wise”. who will understand the deep, sealed matters. They will then achieve knowledge of the Creator to as high a degree as humanly possible, as it says, “For the Earth shall be filled of knowledge of the Lord, as the waters cover the sea” (Isaiah 11:9).
Blessed be Hashem who helped me.