What is the outward expression of the spirit?

Speech

Speech is constant—or at least tends towards continuity. It is the outward expression of the spirit, therefore, it is constant—

Like the expression on a man’s face, which is the outcome of his constant character. 

When a spirit is purified and becomes holy, one, united in himself, he ceases not to cry day and night—

Holy, holy, holy. Not holy am I, but holy art thou, O Lord, towards whom my being ever tends.