While studying the human mind is not my profession, I still find myself paying very close attention to behavior. Body language and the tone of our voice speaks volumes, but most importantly words not heard are the loudest words spoken. Meaning there is more in what you don't say than what you do. We all know the famous line, "say what you mean and mean what you say". Unfortunately nowadays neither are done. However, you can find the truth in someone without them speaking a word. Are they looking you in the eyes when telling you something, are their arms folded while talking to you? Studying or paying attention to behaviors will answer the untold truth, especially if these behaviors are out of the ordinary for the one you know.
Child psychology is what is dear to me. Our babies are acting out trying to tell us things that their littler mouths or heads have yet to fathom. Before spanking, time-outs, or revoked privileges, see where their head is. Study why your child is behaving in such a manor. A 2yr old that is having a 1hour tantrum probably has nothing to do with that toy he/she can't have. Look a little deeper. Could it be the absence of a parent, or the arrival of a new sibling. What about the promiscuous teen that has been labeled a hoe? Could her being raped and not knowing her father have anything to do with her behavior? Everything we do is for a reason. So before you write them off, punish them or simply give up on them, pay attention to them. Remember the loudest words heard are the ones unspoken.