Philosophically, silence has often been examined as a language in hollow. For Heidegger, keeping quiet is not an absence but a modality of saying. In Being and Time he distinguishes authentic reticence, which opens onto the truth of being, from inauthentic muteness, which masks or flees.

Levinas, for his part, stresses that the other is never reducible to what they say: they always exceed their language. Keeping quiet becomes an ethical gesture, a way of respecting that alterity by not saturating it with discourse. When the therapist refrains from speaking, they show a radical availability, leaving space for the other without seeking to fill it with premature interpretations. In this light, it is no longer absence but opening.

In psychotherapy, some experiences — bereavement, trauma, intimate disclosures — are too intense or too unprecedented to be immediately put into words. If it is met with kindness, the person’s muteness can become the setting for those unsayable emotions. The point is not to fill, but to hold.

Anthropologically, as David Le Breton reminds us, silence is always socially coded. In some societies it can mean shame or submission; in others, respect or wisdom.

In many Asian countries, keeping quiet is a way of showing politeness and restraint. One does not speak for the sake of speaking, and the absence of words can amount to assent. In contemporary Western societies, by contrast, dominated by the over-valuing of speech and self-expression, the absence of sound is often read as discomfort or resistance.

In intercultural therapy these differences become crucial: what the clinician experiences as reluctance may in fact be a sign of respect, and what looks like a failure to answer may express a presence embodied otherwise.

The phenomenon also shapes the temporality of exchange. In some cultures long pauses are accepted and even valued: they show that one is thinking, that one grants importance to what has just been said. In other contexts a pause of a few seconds is immediately filled with a word, as though the absence of sound became unbearable.

Some people bear the emptiness as a space of maturation; others experience it as an aggression or a neglect. The therapist’s capacity to tolerate and adjust the length of these moments is an integral part of their clinical skill.

If philosophy and anthropology illuminate the value of this phenomenon in human existence, systems thinking reveals its communicational reach. The Palo Alto school showed that one cannot not communicate. The absence of words is, in that sense, a message in itself. It structures the rhythm of the interaction and produces concrete effects on the therapeutic system: it can soothe, block, provoke, strengthen the alliance or, on the contrary, create tension. Everything depends on its context and its reception.

On the therapist’s side, the absence of speech is just as polysemic. It can be holding, when one refrains from answering immediately so that an emotion can unfold. Catalytic, when one deliberately maintains an emptiness that prompts the person to say more. Shared, when the clinician simply sits in the emotion with their client, without seeking to interpret. It can even be paradoxical, used strategically to interrupt a relational loop: keeping quiet precisely when a verbal answer is expected of you can oblige the system to invent another mode of response.

Silence can first lower emotional tension. In moments of great anxiety, refraining from speech for a few seconds is sometimes enough to give body and mind a breath of reorganisation.

It can also strengthen the therapeutic alliance. After painful words, a respectful pause can be experienced as a deep mark of listening: the therapist acknowledges the gravity of what has just been said by refusing to absorb it too quickly into an explanation.

The absence of words also favours reframing. By interrupting the habitual flow of speech, it suspends the old frame and opens the possibility of a new one. As Watzlawick, Weakland and Fisch stress, change is often born of a shift of frame. The emptiness becomes the breach through which something else can be glimpsed.

Finally, such moments open onto emotion. In a family session, when nobody is speaking any more, glances meet, the atmosphere charges, and suddenly the emotion becomes audible without words. The collective halt, far from empty, is saturated with meaning and with bond.

This dynamic carries risks. Silence can be misread: the person may believe the therapist has lost interest or is judging them. It can become a defence of the therapist themselves, who keeps quiet to avoid their own discomfort. It can also block the process if it lasts too long without being metacommunicated.

Tolerating these suspensions also means accepting not to know, recognising alterity, and letting the system reorganise at its own pace. It is an ethics of patience and presence.