When individuals leave their job, and especially if they do it voluntarily, the mood is likely to be one of gratitude for the opportunity they had to serve.
They may want to leave a blessing on the establishment: "The Lord bless you and keep you; The Lord make His face shine upon you, And be gracious to you; The Lord lift up His countenance upon you, And give you peace." (Numbers 6: 24-26 NKJV)
Or they may simply want to express thanks: "Every time I think of you, I give thanks to my God. Whenever I pray, I make my requests for all of you with joy." (Philippians 1: 3, 4)
Or they may want to predict prosperity:
“But blessed are those who trust in the Lord and have made the Lord their hope and confidence. They are like trees planted along a riverbank, with roots that reach deep into the water. Such trees are not bothered by the heat or worried by long months of drought. Their leaves stay green, and they never stop producing fruit. (Jeremiah 17: 7, 8)