Charles H. Spurgeon on Psalms 66:16

Come and hear. Before, they were bidden to come and see. Hearing is faith's seeing. Mercy comes to us by way of ear gate. "Hear, and your soul shall live." They saw how terrible God was, but they heard how gracious he was. All ye that fear God. These are a fit audience when a good man is about to relate his experience; and it is well to select our hearers when inward soul matters are our theme. It is forbidden us to throw pearls before swine. We do not want to furnish wanton minds with subjects for their comedies, and therefore it is wise to speak of personal spiritual matters where they can be understood, and not where they will be burlesqued. All God fearing men may hear us, but far hence ye profane. And I will declare what he hath done for my soul. I will count and recount the mercies of God to me, to my soul, my best part, my most real self. Testimonies ought to be borne by all experienced Christians, in order that the younger and feebler sort may be encouraged by the recital to put their trust in the Lord. To declare man's doings is needless; they are too trivial, and, besides, there are trumpeters enough of man's trumpery deeds; but to declare the gracious acts of God is instructive, consoling, inspiriting, and beneficial in many respects. Let each man speak for himself, for a personal witness is the surest and most forcible; second hand experience is like "cauld kale het again; "it lacks the flavour of first hand interest. Let no mock modesty restrain the grateful believer from speaking of himself, or rather of God's dealings to himself, for it is justly due to God; neither let him shun the individual use of the first person, which is most correct in detailing the Lord's ways of love. We must not be egotists, but we must be egotists when we bear witness for the Lord.