'Look not back behind thee,' as in Genesis 19:17, means that Lot, who represents the good of charity, should not look to matters of doctrine. 'To look up,' is to look to celestial things. In Genesis 18:22, looking signifies thinking because seeing denotes understanding.

(Odkazy: Arcana Coelestia 2245)

When something is declared as "truth" in the Bible it means it comes from the Lord and is true down to the deepest levels of reality.