In his book Celebration of Discipline, Richard Foster discusses the importance of celebration in the life of a believer. He argues that celebration is not simply a frivolous activity, but rather it is an important part of spiritual formation. Celebration helps us to remember who we are and whose we are, and it allows us to enter into the joy of God. Foster advocates for regular celebrations throughout the year, including special days set aside for thanksgiving, praise, and feasting. He also suggests that we create space in our lives for impromptu celebrations when something good happens. When we take time to celebrate, we open ourselves up to God's presence and experience more of his joy.