"the law controlled us like a prison guard" (See: [[rc://en/ta/man/translate/figs-metaphor]])
## until the revelation of faith ##
"until God revealed that he justifies those who trust in Christ" or "until God revealed that he justifies those who have faith in Christ."
## to bring us to the time of Christ ##
"until Christ came"
## that we might be justified ##
"that we would be declared to be righteous." God had planned to justify us before "the time of Christ"; when that time came, he carried out his plan to justify us.
## childminder ##
This is sometimes translated as "tutor" but it means more than a teacher. The childminder was usually a slave who was responsible for training an heir how to live a moral, productive life.