"Mobilis in mobili" is a Latin phrase that can be translated as "moving within the movable" or "mobile within the mobile". It is often associated with the science fiction novel "Twenty Thousand Leagues Under the Sea" by Jules Verne, where it is used as a motto by the submarine Nautilus.

The phrase represents the idea of navigating through unknown or uncertain environments while remaining adaptable and flexible. It suggests that one must be able to move within the ever-changing and unpredictable conditions of life, like a mobile object within a fluid medium. It can be interpreted as a call to be prepared for whatever challenges come your way and to be able to adjust your approach as necessary to succeed.

--ChatGPT