Mountains are symbolic in life of overcoming one's challenges and rising to the top and succeeding. We all have different challenges in life to overcome that we have chosen from a spiritual level. As we overcome a challenge, we don't have to address it again, we can move onto bigger and better things. This is also the nature of ascension.
Like a mountain, the journey becomes steeper and more challenging the higher you climb; but the rewards are also greater. When you reach the peak of a mountain, you get to see things from a higher and more expansive perspective. You begin to see life the way God sees things. You see the wisdom in God's plan, and because we are a piece of God, we are the plan. You become the observer in life, not the helpless victim. When you reach the peak, you can take a deep sigh of relief and enjoy the expansive view of the world below.