"Strait and narrow" is a phrase frequently used to describe a strict or moralistic way of living. However, there are several synonyms that can convey similar meanings, such as "the right path", "the straight path", or "the righteous path". Another synonym is "the narrow road", which suggests a difficult journey that requires discipline and adherence to a set of values or principles. "The virtuous way" or "the ethical path" are other possible synonyms that emphasize the importance of being honest, fair, and just in one's dealings with others. Whatever the synonym, the idea remains the same: living a life of integrity and morality requires dedication and self-control.