"The secret of tango is in this moment of improvisation that happens between step and step. It is to make the impossible thing possible: to dance silence. This is essential to learn in tango dance, the real dance, that of the silence, of following the melody." Carlos Gavito
One of the great things about Tango is that you don't have to move all the time. In Tango, it is perfectly fine to take a side step and pause... standing completely still for as long as you like. You can gently rock back and forth or rotate your body back and forth slightly... or just be completely still and quiet.
The quote is not just talking about this stillness.. but also about the connection with our dance partner. Our connection exists during the whole dance and goes far beyond the steps that we do.
At the end of a milonga, the women will not remember what steps you executed with them but rather how you connected with her, how your embrace felt and how you stepped rather than the pattern you stepped in.