It is important to remember that other people are not merely extensions of yourself, as though they are an arm or a foot. Recalling this will help you to be patient with others and, more important, to learn from them how to be a better person yourself.
Whatever your relationship to another–teacher/student, father/son, stranger/stranger–acknowledge them as an individual and, being the wiser, meet them where they are and go at their pace.
You cannot make them be what you want them to be, so the wise man will instead make himself who that person needs him to be for as long as he needs to be. In this way you can lead them out of darkness rather than rail at them from your place in the sun.