Marriage vows require us to stand by our partner through sickness and health, be it physical or mental. The mind can be just as vulnerable as the body and may suffer from unskillful patterns such as addiction, fearfulness, self-centeredness, and dishonesty.
We must accept that at some point, both partners may act irrationally, as no one is without flaws. The pledge of marriage acknowledges this imperfection and calls for a commitment to support each other through the highs and lows of life.