'Reason' in the Bible

For this reason I Paul, prisoner of the Christ Jesus for you nations,

For this reason I bow my knees to the Father of our Lord Jesus Christ,

being darkened in understanding, estranged from the life of God by reason of the ignorance which is in them, by reason of the hardness of their hearts,

For this reason be not foolish, but understanding what is the will of the Lord.

For this reason take to you the panoply of God, that ye may be able to withstand in the evil day, and, having accomplished all things, to stand.