A physiciаn is cаring fоr аn elderly patient has fallen and brоken their hip. The patient has had surgery tо repair the break and is a lot of pain. The physician has ordered a morphine drip to relieve the patient's pain, however the physician must consider the side effect that morphine also suppresses respirations. It was decided after consulting with the respiratory team that the patient's respiratory function was stable and morphine would provide the most pain relief for the patient. What is the ethical principle guiding the physician's actions?