Just as totally relaxed actors or musicians aren’t likely to perform at the top of their potential, speakers think more rapidly and express themselves more energetically when they experience .

helpful speech anxiety    

Explanation:

Speech anxiety: In abnormal psychology, the term "speech anxiety" is described as a condition or situation in which an individual or speaker experiences 'nervousness' during or/and before a specific presentation.

Symptoms of "speech anxiety" involves a dry throat, memory loss, sweating palms, a shaky voice, difficulty breathing, etc. These symptoms are often hard to analyze or predict by the person dealing with it.

In the question above, the given statement signifies helpful speech anxiety.

the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.