We all find ourselves in the position for which we are fit, each ball finds its own hole; and if one has some capacity above another, the world will find that out too, in this universal adjusting that goes on. So it is no use to grumble. There may be a rich man who is wicked, yet there must be in that man certain qualities that made him rich; and if any other man has the same qualities, he will also become rich. What is the use of fighting and complaining? That will not help us to better things. He who grumbles at the little thing that has fallen to his lot to do will grumble at everything. Always grumbling, he will lead a miserable life, and everything will be a failure. But that man who does his duty as he goes, putting, his shoulder to the wheel, will see the light, and higher and higher duties will fall to his share.
- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 5/Notes from Lectures and Discourses/On Karma-Yoga