Charles H. Spurgeon on Psalms 139:4

For there is not a word in my tongue, but lo, O LORD, thou knowest it altogether. The unformed word, which lies within the tongue like a seed in the soil, is certainly and completely known to the Great Searcher of hearts. A negative expression is used to make the positive statement all the stronger: not a word is unknown is a forcible way of saying that every word is well known. Divine knowledge is perfect, since not a single word is unknown, nay, not even an unspoken word, and each one is "altogether" or wholly known. What hope of concealment can remain when the speech with which too many conceal their thoughts is itself transparent before the Lord? O Jehovah, how great art thou! If thine eye hath such power, what must be the united force of thine whole nature!