This quote suggests that there will come a day when you will do something you don’t understand, but you will be willing to do it anyway because you love the person you are doing it for. For example, you may not understand why your grandfather wants to move to a smaller house, but you love him so you help him to do it. Or, your daughter may want to take part in a sport you’ve never heard of before, but because you love her and want her to be happy, you decide to help her succeed.