Isa 51:11 Therefore the redeemed of the LORD shall return, and come with singing unto Zion; and everlasting joy [shall be] upon their head: they shall obtain gladness and joy; [and] sorrow and mourning shall flee away.

1. The Lord is the source of Joy
2. Gladness comes from outside our soul  and temporary
3. Joy Springs from inside, It is overflowing and everlasting
4. Joy from God will chase away sorrow and mourning