12th House is all about your unconscious mind, isolation, prison, spirituality, sleep, abstract imagination, Behind the scene kind work, addictions, loss and expense, deception, donations/charity etc.
3rd house is the 4th house from 12th house..let’s explore..
When you get the deep sleep /unconscious mind (12th H) which is good for your biological cycle, your subconscious mind(3rd H) works perfectly during the awakening time.
The proper idea of doing something independent/courageous/initiative (3rd H) only comes when you are able to think /plan something constructive in your alone time/isolation.
You can only do courageous things/own business/independent task (3rd H) when you are mentally prepared /ready to lose /Expenses/subsequent happenings (12th H)…