I don't think it's the cowering fear of flinching when someone makes a quick movement around you, or wetting yourself because you are afraid. I think they mean the respectful fear that we have of people in power, like our boss, like our parents, like our leaders. We don't do a lot of things from fear that we will be punished. I do fear God, but I'm not afraid of him, I respect him as my Lord and my Master and as such I do not want to disappoint Him. Same with my parents, if I do something wrong, yeah, I'm a little bit afraid of them because I know that I'm gonna be in trouble. I think that's what God wants from us...not to shy away from him, but to humble ourselves enough that when we do something wrong, we are afraid of what His reaction is and we come to Him with shame and not boldness of our sins.