Grit is great. In psychological terms, it is the perseverance and stamina to real long term goals and to reach the end state. It is a non-cognitive way of motivating to continue the motivation of those who are trying to reach that end goal. an example of this is in teaching, instead of just simply teaching the subject to students, teach the subject in ways each student will successfully engage and ultimately know how to complete. Working hard for a long duration of time with high motivation is the grit to complete the end goal.