What is the phrase used to affirm a Master Mason's commitment after observing the Obligation?

The phrase "So help me God and continue me steadfast" is significant in the context of a Master Mason's Obligation as it expresses a solemn commitment to uphold the values and responsibilities associated with Freemasonry. This phrase invokes a divine witness to the individual’s promise, emphasizing the moral seriousness of the obligation taken. It reflects the intention to remain firm and unwavering in the pursuit of Masonic principles and duties, illustrating a deep sense of devotion and responsibility that characterizes the journey of a Master Mason. The use of "God" in this affirmation further underscores the spiritual dimension of the obligation, highlighting the expectation of integrity and ethical conduct in all aspects of Masonic life.

In contrast, the other choices do not carry the same weight of solemnity or commitment as they reflect different aspects of brotherhood or fraternity without the direct invocation of divine support or purpose inherent in the correct phrase.