“...And the days of Jacob, the years of his life...”
King Solomon said, “Fear of God adds days, but the years of the bad people are cut off.” A righteous person re-thinks his deeds every day, as if tomorrow he will die. It happens then that every next day of his life is a present, and this is the “Fear of God adds days.” The bad people, however, never think about their death, and it is always unexpected for them; thus their “years are cut off.” Jacob lived every day of his life as a present.
Reuven was a reincarnation of Cain. This is why his mother called him “Reu” (see), “ben” (son) – see my firstborn son, who is going to correct the deeds of another firstborn, Cain. Indeed, instead of killing his brother Joseph, Reuven intended to save him.
However, the fight between Cain and Abel was on account of Abel's twin sister, and that Reuven did not fix. Instead, he removed his father's bed from its tent. As a result, the right of the firstborn was taken away from him, and the next reincarnation of Cain was Jethro.
Art: Vincent Van Gogh - The Bedroom