Charles H. Spurgeon on Psalms 77:12

I will meditate also of all thy work. Sweet work to enter into Jehovah's work of grace, and there to lie down and ruminate, every thought being absorbed in the one precious subject. And talk of thy doings. It is well that the overflow of the mouth should indicate the good matter which fills the heart. Meditation makes rich talking; it is to be lamented that so much of the conversation of professors is utterly barren, because they take no time for contemplation. A meditative man should be a talker, otherwise he is a mental miser, a mill which grinds corn only for the miller. The subject of our meditation should be choice, and then our task will be edifying; if we meditate on folly and affect to speak wisdom, our double mindedness will soon be known unto all men. Holy talk following upon meditation has a consoling power in it for ourselves as well as for those who listen, hence its value in the connection in which we find it in this passage.