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