Which commandment is often summarized by the phrase "Love your neighbor as yourself"?

The commandment often summarized by the phrase "Love your neighbor as yourself" is indeed the second commandment. This phrase encapsulates the essence of treating others with the same care, respect, and kindness that one would wish for oneself. It highlights the social and ethical obligation of individuals to support and love others within their community.

The foundation of this commandment is found in the teachings of Jesus, where He emphasizes this principle in relation to the broader commands concerning love—for both God and neighbor. This commandment extends beyond mere emotions or feelings of goodwill; it calls for actionable love that manifests in behaviors that benefit others.

Other commandments mentioned in the options have different focuses. The first commandment emphasizes the love and loyalty owed to God. The greatest commandment, while it includes both loving God and loving one's neighbor, encompasses a broader idea that includes the love of God as foundational. The last commandment typically refers to prohibitions against coveting and does not relate to the principle of interpersonal love in the same way.

Thus, the correct reference to "Love your neighbor as yourself" distinctly aligns with the second commandment, encapsulating a core tenet of ethical behavior in many moral teachings and religious contexts.