Charles H. Spurgeon on Psalms 145:11

They shall speak...and talk. Joy and sorrow are hard to conceal; as from the countenance, so from the tongue. There is so much correspondence betwixt the heart and tongue that they will move at once: every man therefore speaks of his own pleasure and care; the hunter and falconer of his game; the ploughman of his team; the soldier of his march and colours. If the heart were as full of God, the tongue could not refrain from talking of him: the rareness of Christian communication argues the common poverty of grace. If Christ be not in our hearts, we are godless; if he be there without our joy, we are senseless; if we rejoice in him and speak not of him, we are shamefully unthankful. Every man taketh, yea, raiseth occasion, to bring in speech of what he liketh. As I will think of thee always, O Lord, so it shall be my joy to speak of thee often; and if I find not opportunity, I will make it. —Joseph Hall.