Charles H. Spurgeon on Psalms 116:10

I believed, therefore have I spoken. I could not have spoken thus if it had not been for my faith: I should never have spoken unto God in prayer, nor have been able now to speak to my fellow men in testimony if it had not been that faith kept me alive, and brought me a deliverance, whereof I have good reason to boast. Concerning the things of God no man should speak unless he believes; the speech of the waverer is mischievous, but the tongue of the believer is profitable; the most powerful speech which has ever been uttered by the lip of man has emanated from a heart fully persuaded of the truth of God. Not only the Psalmist, but such men as Luther, and Calvin, and other great witnesses for the faith could each one most heartily say, "I believed, therefore have I spoken." I was greatly afflicted. There was no mistake about that; the affliction was as bitter and as terrible as it well could be, and since I have been delivered from it, I am sure that the deliverance is no fanatical delusion, but a self evident fact; therefore am I the more resolved to speak to the honour of God. Though greatly afflicted, the Psalmist had not ceased to believe: his faith was tried but not destroyed.