Mercury ruling Gemini (the mind, memory) & Virgo (routine, habits) shows in the fact that routine strengthens memory a lot of times even when some factors vary.
For example, weighing ingredients all the time when I cook (work & culinary creation) has made it that I can cook something new on the fly, go about my day, come back the next day & be like “okay now that I got some time to write things down, which quantity of each ingredient did I put in there again?” & just write everything exactly as it was.
My mind is so used to writing all types of quantities down it just retains the information knowing I will have to write it down eventually.
Memory & habits.
Another example of what I often say : things that fall under the same rulership often go hand in hand.