Do not think much over petty questions, and wear out your mind. This constant thinking weighs heavy on your mind, and causes you much worry and anxiety for nothing. Do not let any material thoughts disturb your mind and eat it away.
Do not be like a leaf (of a tree) moved here and there by the wind. Be like a rock, unaffected by gales and storms and standing firm in its place.
What do you do when a fly troubles and disturbs you? You do not worry about it but merely raise your hand and wave it to drive it away from you. In the same way, without giving yourself up to worrying you must drive away the thoughts that trouble you.
-Questions Meher Baba Answered, pp. 40, Editor K. K. Ramakrishnan