Everyone wants to have a right-hand man (or woman), right? Someone you trust implicitly. Someone who will cover for you in a pinch and make decisions just as you would have made them. Someone you can groom to be your successor when the inevitable promotion opportunities come rolling in.
The expression “right-hand man” (as well as the tradition of seating the guest of honor at the right hand of the host) originated from times when leaders had to worry about assassination on a daily basis. Before the days of explosives and automatic weapons, the easiest way to assassinate a leader was to have the person sitting to his right grab his sword arm and hang on, rendering him relatively helpless so that others in the room could then kill him. If you were a leader, it was in your best interest to put the person you most trusted next to your sword arm. Since most people are right-handed, the “right-hand man” came to be synonymous for someone you could trust with your life.
Leadership can be a lonely role. Having a right-hand man (person) will encourage you when things get rough. A trusted “second-in-command” can keep an eye on your blind spots and warn you when you’re stepping into dangerous territory. If you don’t have one, it’s never too late to develop that person (or to look for someone with the right qualities to fill your next open position.)
(Interestingly enough, the word “sinister” originally meant “on the left.” Maybe that’s where we get the idea of “hold your friends close but your enemies closer.”)