For the Lord will comfort Zion, He will comfort all her waste places; He will make her wilderness like Eden, and her desert like the garden of the Lord; Joy and gladness will be found in it, thanksgiving and the voice of melody. Isaiah 51:3
Joy: exultation, cheerfulness; specifically, welcome - gladness, joy, mirth, rejoicing
Gladness: lighthearted; merry; cheerful, blithesomeness
Thanksgiving: in songs of liturgical worship (of or relating to formal public worship)
Voice: meaning to call aloud, thunderous
Melody: as subject of song, to celebrate in song and music -- give praise
The prophet exhorts the children of Abraham to trust in the Lord; and briefly, but beautifully, describes the great blessedness which should be the consequence, Isaiah 51:1-3.Adam Clarke Commentary
Listen to Me, you who follow after righteousness, You who seek the Lord. Isaiah 51:1a
Obeying God fills one with a sense of awe, wonderment and cheerfulness. Blithesomeness (a new word for me), meaning:
Blithe: without thought or regard; carefree; joyous or merry in disposition
Some: characterized by
So, the result of trusting and obeying God is being characterized with a disposition of joyfulness!
Disposition: the predominant or prevailing tendency of one's spirits; naturalmental and emotional outlook or mood; characteristic attitude.
Blithesomeness the PREDOMINANT tendency of one's spirit, characteristic attitude—that's what Thanks Living is all about! Having a predominate tendency to give thanks and praise to God! And notice is all STARTS with trusting God.