"Be of one" is a phrase that often refers to working together or having a unified attitude or goal. There are several synonyms that can be used in place of "be of one." The first synonym that comes to mind is "united." When individuals come together and work towards a common objective, they become united. Another synonym that can be used is "unified." A group of people who share a common understanding of a specific issue and work towards a solution can be described as unified. Additionally, "harmonized" can be used to suggest a collective effort towards a common goal. Overall, these synonyms emphasize the importance of collaboration, teamwork, and unity in achieving shared objectives.