There is a profound danger that comes with being entrusted with anything in life. Danger way beyond familiarity and that danger is getting attached. We should thus be careful to what degree we hold close what we are entrusted with: as long as it does not belong to us, we should hold it with a certain delicacy limited by ownership. No matter how close nor how long, it is important to know treating anything as if it is your own is different from addressing it as if it is your own. This discerning moment if kept alive would help all that are set in the place of a steward to do care for all things as if they were their own: but to not address them as their own.
It is critically important as it is devastatingly repercussive.
This brings up a curtain or demarcation of both approach and usage. If it does not belong to us: we need the owner's consent in all limits of usage and approach. Though familiarity do play a role in the issue of drawing that line, one should know and be well defined by the limits set and by the approach (Principle of Order) given or else they end up serving outside the scope of the one who sent them. Meaning they are liable for a replacement as they would have lost relevance and purpose to the owner of the sum of things. It is not just vital but also brutally critical to be defined in all that we do. A thing that draws from the approach or limit of order we do serve and exist under.