This is the central idea of the Gita- to be calm and steadfast in all circumstances, with one's body, mind, and soul centered at His hallowed feet!
Swami VivekanandaAll power is within you; you can do anything and everything. Believe in that, do not believe that you are weak; do not believe that you are half-crazy lunatics, as most of us do nowadays. You can do any thing and everything, without even the guidance of any one. Stand up and express the divinity within you.
Swami VivekanandaStruggle hard and then if you do not succeed, you are not to blame. Let the world praise or blame you. Let all the wealth of the earth come to your feet, or let you be made the poorest on earth. Let death come this moment or hundreds of years hence. Swerve not from the path you have taken. All good thoughts are immortal and go to make Buddhas and Christs.
Swami Vivekananda