Midrash su Ecclesiaste 5:2

"Happy is the man who makes the Eternal his trust" (Tehillim 40:5) - this is Yosef. "And does not turn to the proud" (ibid.) - since he said to the chief of drinks, "remember me... and mention me..." (Bereishit 40:14), two years [in jail] were added for him. "Happy is the man who makes the Eternal his trust" - Rabbi Yudan said, many myriads of proud ones who "pursue deceit" (Tehillim 40:5) - woe to him and to one who trusts in him. "Dreams come with much brooding" (Kohelet 5:2) - Paroh said, "Whose existence is dependent on whom? Me on my god, or my god on me?" He said to him, "You are dependent on your god: behold it is written "And it was at the end [of two years, and Paroh dreamed that he was standing on the Nile,]" (Bereishit 41:1)". "For from the jailhouse one can come to rule" (Kohelet 4:14) - this is Yosef, who came from the jail of paroh and came to rule - "And Paroh sent [for Yosef]..." (Genesis 41:14). "And even in his kingship can come to poverty" (Kohelet 14:4) - in the kingship of Yosef was born the poverty of Potifar. Another take, "And it was at the end" (Bereishit 41:1) - "I saw all life which walks under the sun" (Kohelet 4:15) - this is Yosef. "they were with the second son" (ibid.) these are the two years that were added for him. And why were two years added for him? So that Paroh could dream and he could grow great by means of this dream, as it says "And it was at the end of two years of days." (Bereishit 41:1)