Spiritual renewal.                                spiritual renewal is pretty close or related with religion, but at the same time I think that you can have a spiritual renewal without you have to belong to a specific religion. I think you can have a renew or refill in that way. For example you can retire yourself in a monastery or a mount or whatever place where you find peace, you need to avoid hectic places and you need people vibrant that motivate your will. fasting is a great way of get your spiritual renewal you can do it, refrain from the thing that you love is for me really good. Other thing in which you have to work is in your humility and gratitude that two thing are essential for replenish your soul. You can do all that thing without you have to  belong of any religion. In the same way if you belong to any religion you can do that thing too many religions like eastern religion uses fasting.