Differences in languages and colour are mentioned among a host of other natural and human phenomena, and are all considered as proofs of God's existence. The fact that they are referred to in this manner, without being singled out for special study, is a further indication that they are merely one of many phenomena, to be meditated upon as others are, and providing, like them, matter for that contemplation which implants deeper faith in the soul and inspires it to action based on charity and mercy.