How can one prove themselves to be a fellow craft?

The correct answer relates to the symbolism represented by the square, which is a fundamental tool of the Fellow Craft degree in Freemasonry. The square is often regarded as a symbol of virtue and moral rectitude. It teaches the importance of conducting oneself in a manner that is fair, just, and honorable. By demonstrating a solid understanding and application of these principles in one’s life, an individual can prove themselves as a Fellow Craft.

In Masonic teachings, the square encourages members to align their actions with ethical standards and to treat others with equity and respect. This exemplifies the essence of being a Fellow Craft, highlighting that one's character and behavior are essential indicators of their status in the fraternity.

Knowledge of the lodge, the compass, and one's reputation in the community are certainly relevant aspects of a Mason's journey and can reflect one's standing and commitments; however, they do not encapsulate the core moral framework that the square represents in affirming someone's qualifications as a Fellow Craft. The focus of the question is to identify a specific symbol that embodies the principles of the degree, and the square distinctly fulfills that role.