Just like you run out of fuel in the car and you have to refill it again and again, in the same way your dedication and commitment runs out in the course of time and it needs constant renewal!
You have to dedicate and rededicate again and again.
Often people take their dedication for granted and then the mind starts demanding or complaining. When dedication is not complete, it leads to grumbling and complaints.
Total dedication brings enormous enthusiasm, zeal, trust, and challenge, and does not leave any room for ego.