For Ourselves And Our Posterity

I wrote when we place our self meaning each one of us, his or her self -- and was told to use "ourselves" instead. Observations indicate, Please include the research you’ve done, or consider if your question suits our English Language Learners site better. Additionally, In the singular, it is quite clear that one uses "I" when referring to a third party and oneself, as in: Bob and I are going to build an aircraft. Furthermore, Usually I would use something such as "keep this between ourselves" or "sort this out amongst ourselves" or "figure this out ourselves", but I cannot help but feel there should be a good expression to use. These findings regarding For Ourselves And Our Posterity provide comprehensive context for understanding this subject.