And among His Signs is the creation of the heavens and the earth, and the difference of your languages and colours. Verily, in that are indeed signs for men of sound knowledge.( سورة الروم , Ar-Room, Chapter #30, Verse #22)
That is, "Although your vocal chords are similar, and there is no difference in the structure of the mouth, the tongue and the brains, yet people speak different languages in different regions of the world. Even in the regions where the same language is spoken different dialects are spoken from city to city and from town to town. Moreover, the accent and pronunciation and the style of speech of every person is different from the other.
Similarly, although the semen and the formula of your physical structure is the same, yet your colors are so different that, nations apart, even the color of the two sons of the same parents is not exactly the same.
In this verse, attention has been drawn only to two aspects, but if one looks around one will notice an unite variety everywhere in the world. One will find countless differences in the species of man, animal, plants and other things in spite of the basic uniformity in their different members; so much so that no member of the species is exactly identical with the other. Even the two leaves of a tree are not exactly alike.
This shows that the world is not a factory in which automatic machines might be working and turning out things in mass production bearing the stamp of their own separate species. But in this factory there is a Master-Artist at work, Who gives individual attention to everything and produces it on a new design with new embellishments and proportions and qualities, and everything thus produced is unique in its own way. His inventive genius is turning out a new model of everything every moment, and His creative power abhors repeating the same design the second time.
Anyone who sees this wonderful phenomenon with open eyes, can never be involved in the foolish misconception that the Maker of the universe has gone to sleep after having made it go. This is, on the contrary, a clear proof of the fact that He is ever engaged in His creative activity, and is giving individual attention to each and everything in His creation.
Taken from: Sayyid Abul Ala Maududi - Tafhim al-Qur'an - The Meaning of the Qur'an
p/s: even babies have their own language! Watch it here