Yet did not the chief butler remember Joseph, but forgat him. – Genesis 40:23

Joseph learned that temporal things are not to be depended upon. The indulgences of his father’s house end in his being sold as a slave, and the coat of many colors is dipped in blood. His prosperity in the house of Potiphar also came to a sudden end, and from being an overseer he became a prisoner in irons. Now he knew that earthly good is not to be depended on, and therefore not worthy to be the object of pursuit to an immortal soul: he sees that all things beneath the moon change, waxing and waning as doth the moon itself, and he learns to look to something higher and more stable than circumstances and surroundings.

He, too, was instructed in one sad truth, which we are all so slow to learn, namely, to “cease from man whose breath is in his nostrils, for wherein is he to be accounted of?” I do not think Joseph had learned that fully when he interpreted the dream of the butler. It was very natural, and therefore not to be censured that he should say, “Think of me when it shall be well with thee;” but when two whole years had passed and all the while he was forgotten, Joseph must have felt that, “Cursed is he that trusteth in man and maketh flesh his arm.” He ceased from man, and no longer looked for enlargement from that quarter. Cost us what it may, we are great gainers by any process which enables us to say, “My soul, wait thou only upon God, for my expectation is from Him.” It is a blessed thing when providence knocks away all the dogshores, and lets the vessel launch into her true element. See how freely she floats upon the deep sea of God’s everlasting love and immutable faithfulness. She is no more liable to decay from the dry rot of carnal confidence, but on the broad sea of divine power “she walks the waters as a thing of life” in joyful reliance upon the ever blessed God. Confidence in man seems bred in our bone, but it must be taken out of us, and happy shall the day be which sees us rid of all hope but that which stays itself upon the Lord alone. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1277.cfm