Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: +++ '#Dearly #beloved, avenge not yourselves, but rather give place unto #wrath: for it is #written, #Vengeance is #mine; I …' #Romans12v19