FAQ:Do we have to remember everything as a believer in Jesus Christ?

(Luke 12:11-12 [KJV])
 [11] 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:
 [12] For the Holy Ghost shall teach you in the same hour what ye ought to say.

No the Holy Ghosts quickens things to us when we need them.