Walking refers to the act of moving by setting each foot forward in an alternate pattern. To be responsible refers to the quality of being answerable for our actions and their consequences. 

It also refers to the capability to acknowledge and respond reasonably when our conducts and obligations come under scrutiny. 

Joshua and Caleb demonstrated responsible conduct in the assignment given to them by Moses to spy the Promised Land (Numbers 14:17-33). However, ten out of the twelve spies came back with evil and discouraging reports which precipitated a rebellion against Moses and Aaron