In an article entitled Updating the Chicago Statement on Biblical Inerrancy: A Proposal, Derek J. Brown discusses several possible revisions to the 1978 Chicago Statement on Biblical Inerrancy, a document produced by a number of Evangelical Christian scholars, pastors, and laymen defining the doctrine of Biblical Inerrancy, the teaching that the Scriptures are fundamentally without error. In Article IV of the Chicago Statement, the authors "affirm that God who created mankind in His image has used language as a means of revelation." Brown suggests that this affirmation be modified to "indicate unambiguously that [God] has designed human language for the very purpose of providing a sufficient vehicle for divine revelation." In other words, God endowed human beings with language so that He might be able to reveal Himself to them.
If it is true that God created humans with an ability to understand and use language so that He could reveal Himself to them, then at least one distinctive characteristic of human language is explained. That distinctive characteristic of human language is that it can be used to refer to abstract ideas, like love, mercy, and justice. This is what makes human language different from the forms of communication used by animals. As neurosurgeon Michael R. Egnor points out in a blogpost at mindmatters.ai, both humans and animals communicate using signals, which he defines as "a concrete sign that has a physical relationship with the object it signifies." Such signals would include gestures toward an object or making a sound as a warning. On the other hand, only humans can use designators, which "point to objects--things or concepts--abstractly." For example, we can use the word cat to refer to a specific type of animal--which has a physical existence--even though the word itself "has nothing physically to do with a cat." In addition, we can use a word like justice to refer to a concept, which has no physical existence at all.
It is this latter ability to use language to refer to abstract concepts that may explain why God created human beings with a capacity for language. As Egnor notes, without an ability to refer to use a word like mercy to refer to an abstract concept, "we could imagine situations, persons, or objects that might be associated with mercy, but we couldn't contemplate mercy itself unless we had a word for it. Mercy isn't a physical thing we can point to." And without a word like mercy and an ability to understand what it means, we would be unable to know what it means when God reveals Himself to us as being full of mercy, for example--or just or good.
In short, whatever other reasons there may be for our Creator endowing us with the gift of language, it is almost certain that one reason human language exists is for God to reveal Himself to us, so that we be able to come into relationship with Him. It is because language uniquely enables humans to understand abstract concepts like love, justice, mercy, and grace that humans can truly know God.
Image of the Holy Bible from Wikimedia Commons