The following is an exploration into the question: How does thinking relate to saying? It is a philosophical essay I had written in the past about Martin Heidegger’s thoughts in his book Being and Time. I don’t remember which book I used to get the quotes from so I am unsure if the page numbers coincide directly with every version of his book. Alternatively, if you are having trouble finding the quotes in your version of the book, I would suggest copy and pasting a section of the quotes I used into Google and looking up which sections correspond to which quote. This article by James Fieser has some of the quotes I use with the sections cited with them, along with other notes.

How does thinking relate to saying?
Saying is the verbal manifestation of thinking. Thinking is primarily concerned in the subconscious, while saying is in the realm of conscious effort as it takes reflection and deliberate intention in order to communicate what one says. Heidegger references Dasein, or “there-being”, where all modes of thinking originate and exist. Dasein requires world-relation in order to exist, as its relationship and interaction with the world is what colors all its worldview. Dasein seeks to understand and comes to understanding through an introspective reflection on the subjects at hand, continually and ceaselessly rearranging its own contents. A conscious being not only thinks about things to come to an understanding of it, but also expresses its understanding externally in order to communicate its own knowledge and engage in discourse for more knowledge. Heidegger expresses this in the following passage: “[…] Understanding in itself has the existential structure which we call project[ion]. […] The project[ive] character of understanding constitutes [Dasein’s] being-in-the-world with regard to the disclosedness of its there as the there of a [possible being]. And, as thrown, Dasein is thrown into the [way] of being of projecting. Projecting has nothing to do with [relating oneself] to a plan thought out, according to which Dasein arranges its being, but [rather], as Dasein, it has always already projected itself and is, as long as it is, projecting. As long as it is, Dasein has understood itself and will understand itself in terms of possibilities” (Heidegger 136). Understanding is in the realm of possibility, where there will be no complete or infinitely objective Truth as Dasein has sense-perceptive, cognitive, situational, and time-constricted limitations that affect understanding.
Phenomenology is the only way to approach the ontological questions; the questions about fundamental being. This is a nod to traditional metaphysics while also trying to deconstruct the tradition itself, re-contextualizing the information to come to a deeper understanding of it. I acknowledge that the purpose of Heidegger’s phenomenology is to approach the ontological questions in an attempt to deconstruct and revitalize the claim, however I critique that there is no need to do this when it comes to thinking and saying.
By consciously thinking something into being, Dasein has already interacted with “saying” as it says to itself what it thinks. Dasein also already “says” about a subject when it thinks about it, as Dasein is constantly relating to whatever is at hand: ““Understanding is the existential being of Dasein’s own[most] possible being, [such that] this being discloses in itself what its [very] being is about” (Heidegger 135). Any public discourse that stems from the individualized thinking, or in other words, any external “saying” that happens between two individuals, is presupposed by the individuals’ subjective thinking. Therefore, saying is permanently tied to thinking in the sense that one must think a subject in order to have anything to say about it. It’s hard to argue against this, but I also see no reason to question or differentiate between the two. Why posit that saying is in a different realm from thinking? It is interesting to dissect the importance of thinking in what one says, but to say that thinking is different than saying or work in separate ways is to say that an almond is not a nut, or is different than a nut. One is a subsection of another, encompassed in the mode of being that is Dasein.
Finally, Heidegger makes interesting points to listening as an integral existential part of Dasein: “Listening to … is the existential being-open of Dasein as being-with for the other” (Heidegger 153). By listening to what another individual is saying, there is an exchange of understanding of each other’s being. It is primarily through saying what one thinks to another individual, and having that individual listen to the content of what is being said, that defines its understanding of being-in-the-world. As we have already established that the act of relating is imperative to Dasein’s existence, the act of listening is imperative in relating. It is through an open inquiry of the other’s words and self-reflection of what is being said that Dasein maintains its own sense of authenticity in the world: “Hearing even constitutes the primary and authentic openness of Dasein for its ownmost [possible being], as in hearing the voice of the friend whom every Dasein carries with it. Dasein hears because it understands. As [understanding] being-in-the-world [with others], it ‘listens to’ [and is bound to, hörig] itself and to Mitdasein [being-there with], and in this listening [being bound] belongs to these” (Heidegger 153).