Bassanio finds the scroll in the lead casket, which is the right choice.
The scroll reads:
You (the person) who chose not by sight alone (who was not misled by the glitter of gold or silver) stood a fair chance and has made the right (true) choice.
Since you have been so fortunate (to have chosen correctly), be happy with your choice for there is no need to look any further.
If you are satisfied with this and see this stroke of luck as a symbol of your (future) happiness, turn to your lady and claim her with a warm, passionate kiss.
Bassanio then praises the kindness of the scroll and turns to Portia and seeks her permission to claim his prize (Portia), which he has won as if he had competed against another in a fair contest. He humbly states that he is overwhelmed and wonders if he is worthy of his prize, unsure if she is actually his or not. He further states that he is still doubtful until his claim is confirmed and signed by Portia.