Some things that are essential to your spiritual diet only grow in valleys. Others grow on the plains. Little grows on mountain tops and nothing on which you can long support spiritual life.
Mountains are for exhiliration and to serve as markers to which you can point back and relive the temporary thrill. Only when you get to heaven will that thrill become lasting.
In this life, if you can’t experience joy, peace, fulfillment and all the other legitimate human desires on the plains and in the valleys you will not find them much during your Christian walk.