Para-Gram by Parmahansa Yogananda

Knowing that you are a child of God, make up your mind to be calm no matter what happens. If your mind is fully identified with your activities, you cannot be conscious of the Lord, but if you are calm and receptive to Him within while being active without, you are rightly active. Each time a swarm of worries invades your mind, refuse to be affected; wait calmly while seeking the remedy. Spray the worries with the powerful chemical of your peace. You cannot buy peace; you must know how to manufacture it within, in the stillness of your daily practices in meditation. When you think that you have reached the utmost depth of silence and calmness, go deeper still. In the silence you will receive from God the answers to your life's problems.