We must worship with the anticipation that God will graciously manifest His acceptance of our worship with unmistaking evidences of His presence. Too often we go through “worship motions” routinely and thoughtlessly without any expectations of consequence. To expect nothing is to get nothing. But God has promised to draw nigh to those who draw nigh to Him. What Isaiah saw was visionary symbolism, so we should not necessarily expect physical quaking or visual theophanies, nevertheless, we have every right to expect God to move within our hearts as with our hearts we give voice to praise.