Have you ever worked in hometown theatrical groups? Maybe you enjoyed drama club in high school or college. In your speaking roles, the director expected you to know the dialogue. Even if you were an extra with only a small speaking part, memorization was mandatory. Oops, you forgot your line. Off stage, a prompter fed you your lines.
The Holy Spirit is prompting the faithful. “And when they bring you unto the synagogues, and unto magistrates, and powers, take ye no thought how or what thing ye shall answer, or what ye shall say: For the Holy Ghost shall teach you in the same hour what ye ought to say (Luke 12:11-12 Pilgrim Study Bible).” Feed on His word and He will feed you your lines.