When Joseph and his two sons left Jacob, his brethren, envious of the bountiful blessings bestowed upon the three, said, "The whole world loveth a favorite of fortune, and our father hath blessed Joseph thus because he is a ruler of men." Then spoke Jacob: "They that seek the Lord shall not want any good thing. I have blessings enough for all."[381] Jacob summoned his sons from the land of Egypt, and bade them come to him at Raamses, first, however, commanding them to make themselves clean, that the blessing he was about to bestow might attach itself to them. Another one of his commands was that they were to establish an Academy, by the members of which they were to be governed. When his sons were brought into his presence by the angels, Jacob spoke, saying, "Take heed that no dissensions spring up among you, for union is the first condition of Israel's redemption," and he was on the point of revealing the great secret to them concerning the end of time, but while they were standing around the golden bed whereon their father lay, the Shekinah visited him for a moment and departed as quickly, and with her departed also all trace of the knowledge of the great mystery from the mind of Jacob.[382] He had the same experience as his own father Isaac, who also had loss of memory inflicted upon him by God, to prevent him from revealing the secret at the end of time to Esau, when he summoned him to receive his blessing. The accident made Jacob apprehensive that his sons were not pious enough to be considered worthy of the revelation concerning the Messianic era, and he said to them, "Ishmael and the sons of Keturah were the blemished among the issue of my grandfather Abraham; my father Isaac begot a blemished issue in Esau, and I fear now that among you, too, there is one that harbors the intention to serve idols." The twelve men spake, and said: "Hear, O Israel, our father, the Eternal our God is the One Only God. As thy heart is one and united in avouching the Holy One, blessed be He, to be thy God, so also are our hearts one and united in avouching Him." Whereto Jacob responded, "Praised be the Name of the glory of His majesty forever and ever!"[383] And although the whole mystery of the Messianic time was not communicated to the sons of Jacob, yet the blessing of each contained some reference to the events of the future.