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Among the wonders which science has achieved, it has succeeded in bringing things which are invisible and impalpable to our senses within the reach of our most accurate observations. Thus the barometer makes us acquainted with the actual state of the atmosphere. It takes cognisance of the slightest variation, and every change is pointed out by its elevation or depression, so that we are accurately acquainted with the actual state of the air, and at any given time. In like manner the Christian has within him an index by which he may take cognisance, and by which he may measure the elevation and degrees of his spirituality — it is the spirit of inward devotion. However difficult it may seem to be to pronounce on the invisibilities of our spirituality, yet there is a barometer to determine the elevation or depression of the spiritual principle. It marks the changes of the soul in its aspect towards God. As the spirit of prayer mounts up, there is true spiritual elevation; and as it is restrained and falls low, there is a depression of the spiritual principle within us. As is the spirit of devotion and communion with God, such is the man.

(H. G. Salter.)

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KJV: Not slothful in business; fervent in spirit; serving the Lord;

WEB: not lagging in diligence; fervent in spirit; serving the Lord;