"Thou hast turned for me my mourning into dancing: thou hast put off my sackcloth, and girded me with gladness; To the end that my glory may sing praise to thee, and not be silent. O LORD my God, I will give thanks unto thee forever." -Psalm 30:11-12, KJV

God has truly taken away the mourning of our doom and given us both the joy of heaven in eternity and the joy of the Christian life on this earth. All He asks in return in that we thank Him and praise Him. What a wonderful God!