'Harmony' in the Bible

And this is in harmony with the language of the Prophets, which says:

and the Searcher of hearts knows what the Spirit's meaning is, because His intercessions for God's people are in harmony with God's will.

To Him who has it in His power to make you strong, as declared in the Good News which I am spreading, and the proclamation concerning Jesus Christ, in harmony with the unveiling of the Truth which in the periods of past Ages remained unuttered,

Now I entreat you, brethren, in the name of our Lord Jesus Christ, to cultivate a spirit of harmony--all of you--and that there be no divisions among you, but rather a perfect union through your having one mind and one judgement.

Where can harmony between Christ and Belial be found? Or what participation has a believer with an unbeliever?

when He made known to us the secret of His will. And this is in harmony with God's merciful purpose

united by mutual love, with harmony of feeling giving your minds to one and the same object.