Basil could speak about the Bible only in this way, because of the allegoric method of explaining the scriptures. Allegoric method means, the text of the scriptures, especially the Old Testament is understood as a picture, as a story of examples, which should explain the deeper sense of scriptures. For Basil speech is like life. Speech is kinetic energy expressing God's creative moral order. It is a sign of life.
Silence means death.
Words were understood by him as an active and living presence. Just deeds became a voice before God. Hence active presence according to Basil meant a socially active life. The Christian uses words to improve the society. Words were important to build Christian community.