Charles H. Spurgeon on Psalms 105:19

Until the time that his word came. God has his times, and his children must wait till his "until" is fulfilled. Joseph was tried as in a furnace, until the Lord's assaying work was fully accomplished. The word of the chief butler was nothing, he had to wait until God's word came, and meanwhile the word of the Lord tried him. He believed the promise, but his faith was sorely exercised. A delayed blessing tests men, and proves their metal, whether their faith is of that precious kind which can endure the fire. Of many a choice promise we may say with Daniel "the thing was true, but the time appointed was long." If the vision tarry it is good to wait for it with patience. There is a trying word and a delivering word, and we must bear the one till the other comes to us. How meekly Joseph endured his afflictions, and with what fortitude he looked forward to the clearing of his slandered character we may readily imagine: it will be better still if under similar trials we are able to imitate him, and come forth from the furnace as thoroughly purified as he was, and as well prepared to bear the yet harder ordeal of honour and power.