Kommentar zu Dewarim 12:23

רק חזק לבלתי אכל הדם ONLY BE STRONG THAT THOU EAT NOT THE BLOOD — From the fact that it states, “Be strong” (make a special effort), you may learn that they had a prediliction to blood — to the eating of it; it was therefore necessary to state, “be strong”. This is the view of R. Judah. R. Simeon, the son of Azzai, however, says: Scripture merely intends to caution you and to teach you to what great an extent you must strive to fulfil the divine commandments in general. If, as regards blood from which one can easily keep aloof since one does not long for it, it felt it necessary to insist on a strong effort on your part when forbidding it to you, how much the more is it necessary for you to make great efforts in keeping other commands [the fulfillment of which requires much moral strength] (cf. Sifrei Devarim 76:1-3).

רק חזק לבלתי אכול הדם, even though you hope that by eating the blood you will be able to divine the future as do the demons as our sages said in Chagigah 16 that upon eating blood one can hear the future in the same manner as do the ministering angels.” [On that folio the Talmud does not describe the demons as eating blood, specifically; also the Talmud describes the knowledge of the demons of future events as not based on their intelligence, but as something they overheard in the celestial regions. Nachmanides elaborates on all this, particularly in his commentary on the relevant verse in Acharey Mot. Ed.]

רק חזק לבלתי אכול הדם, seeing that the blood is scattered and embedded in all parts of the flesh it requires special effort to extract it all before eating the meat.