The person who lends something cherished has accepted uncertainty for your benefit.

Lending something you love means accepting a risk you cannot control. It might come back marked, or late, or not at all, and the owner has decided in advance that your use of it is worth that uncertainty. The decision is easy to miss, because the object usually returns fine and the risk was invisible the entire time. Trust is what was actually handed over.

Return borrowed things earlier than you need to and in better condition than you received them. Say what it did for you, since the owner took the chance in order to find out.