In order to warn his fellow believers about Jews who would try to get them to follow the old laws, Paul gives his own testimony about when he persecuted believers.
# For me to write these same things again to you is no trouble for me
"It is no trouble for me to write these things again to you"
# and it keeps you safe
Here "these things" refers to Paul's teachings. You can add this alternate translation to the end of the previous sentence. AT: "because these teachings will protect you from those who teach what is not true" (See: [[rc://en/ta/man/translate/figs-explicit]])