Peri HaAretz

“And HaShem blessed Avraham with everything.” In the Midrash “Because of the Tithes, and it says ‘and he gave him tithes from everything’.”

And the matter is in accordance with the words of the Zohar on “And Avraham was old, advanced of days” (see there). In order to explain the matter lucidly, as the Rabbis told in regards to Barzelai the Geladite who was eighty years old and said “Can I tell the difference between good and bad? Can your servant taste what he eats and drinks?” And the Rabbis said “He removes the speech of men of trust and takes away the understanding of the aged”

Behold, in truth in regards to all the inclinations of the world it may be said that ‘the way of the adulterer is to try and “satisfy his hunger”.’

And so the Sages said “Man does not die with half his inclination still in his hand” and therefore they ‘age’ the understanding of Man so that his understanding is never calm and constantly lusting. And as the text says the “craving of a lazy man kills him”, and the statement “hope deferred sickens the heart...”