solvitur ambulando

Latin phrase

sol·​vi·​tur am·​bu·​lan·​do ˈsȯl-wi-ˌtu̇r-ˌäm-bu̇-ˈlän-dō 

: it is solved by walking : the problem can be solved by a practical demonstration

—referring to Diogenes' response to the claim that motion is unreal by getting up and walking