What do people mean when they say “Beware of Greeks bringing gifts?”

Beware of Greeks bearing gifts. Do not trust enemies who bring you presents they could very well be playing a trick. The saying is adapted from the words of Laocoon in the story of the Trojan horse.

must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"

according to romans 13: 1-7, 1st peter 2: 12-14, and 1 timothy 2: 1-4, christians as citizens have specific responsibilities to a nation that gives liberties to its people. christians are obliged to live as good citizens by submitting to the human government. honor, or respect, is due to men in the high governmental station. a christian should reflect such respect not to gain some favor but because it is god’s will. peter 2: 14 notes that the purpose of the human government is to promote peace and justice in society. to submit to human government, peter includes three elements; obedience, respect, and good deeds.