We can only speak of Resonance when there is an active response to this touch (or invocation). This always expresses itself as a bodily reaction, which in everyday language is expressed in the development of "goose bumps", in the "hairs on the back of the neck" or in a shiver that "runs down the spine", and which can be measured medically in a change in skin resistance, breathing rate or heartbeat and blood pressure.
Secondly, resonance means that we react to the calling impulse and go towards what touches us. The term Emotion is quite suitable for this second characteristic, because it denotes the outward movement (*e-movere*), the response.
From this perspective, resonance in the full sense only occurs when and where we are also able to reach the other side for our part, when we feel effectively and vividly connected to the world, because we ourselves are able to bring about something (for its part affecting) in the world.
Hartmut Rosa therefore calls this second moment self-efficacy (*Selbstwirksamkeit*). The simplest case of such a resonance relationship is in the exchange of a glance or in a dialogue in which the two speakers hear and respond to each other reciprocally. **Eyes are windows of resonance**; to look someone in the eye and feel their returning gaze is to enter into resonance with them – unless we block ourselves from doing so by repelling them with a hostile stare or ignoring them with a dull gaze. Then we are in a state of Alienation, that is, in a relational mode of indifference or hostility.
To be reached and meant by a responding voice and, conversely, not only to make one's own voice audible, but to experience it as effective: This is a basic human experience that even precedes the change of perspective; it belongs to the life-giving discoveries of the infant as well as to the promise of happiness of democracy – if it is practised in the mode of listening and responding and not in the mode of shouting down and deafness. Of course, we experience ourselves as self-effective and touched at the same time not only in interpersonal contact, but also, for example, when we learn to play a musical instrument, jump into the ocean and swim or bake a loaf of bread. In a more subtle sense, we can also speak of self-efficacy when we not only read a book, but begin to *process* it.
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