The trees provide cool shade and sweet fruits equally to all, whether they have fostered them or harmed them. They teach man this lesson of equal?mindedness. The mountains, by bearing heat and cold, wind and rain alike, teach man not to care too much for the body. The birds take no thought for the morrow and are content to live on what they can get. They teach man the lesson of contentment and indifference to the future. Nature thus teaches man in many ways to give up ideas of "I" and "mine" and look upon God as the supreme preceptor.