Candid pictures are like unprepared pictures. They may or may not turn out the way we want but it is when we are in our most natural, comfortable state.
It is when we let our guard down and when we do not know that the photographer is taking the photo.
That is our most natural self.
In life, we should choose to be candid, to speak the truth, to be ourselves, in our own natural state. That is when we will present something, that speaks true to ourselves, presenting the most honest opinion we can give, to the other party.