Spoken Language plays a relative importance to body language. It's not right to rely on body language alone to read someone's thoughts. Spoken Language can aid us very well when we convey messages to other people. Making sure that your body language is appropriate to what you're saying is a difficult but achievable thing to do! ^_^

For more/detailed info about this, please visit the site below:
http://talk.superbodylanguage.com/read-body-language/what-percent-of-communication-comes-through-body-language/

Ill have to agree somewhat with talkbodylanguage

We can rely solely on spoken communication in a world where everyone tells the truth, but body langauge analysis is a good safety net to have for when others are holding back on their feelings.

Thanks
Dave
http://www.ultimatebodylanguage.com/the-need-to-know-basics/

We have all faced instances when we have wondered if a person really means what he is saying. This is because they fail to back up their words by their actions. This thought made me delve more into the subject after which I did some research to realize that actions do in-fact talk louder than the words in more sense than one.

Communication consists of three major elements. The words we use, our tone of voice and our body language. According to a research, the total impact of our communication consists of words (7%), Tone of voice (38%) and body language (55%). For an effective communication to take place, all three parts of the message must be congruent and consistent with each other.

Body Language or “Kinesics” is the study of nonverbal communication. Body language is a combination of eye movement, body orientation, hand movement, head position, and leg activity. When messages from all these parts are combined there is a lot ones body speaks. Although not an exact science, the serious student of body language can gain an extraordinary advantage in both social and professional situations. The idea that certain forms of nonverbal communication are universal to all humans dates all the way back to Darwin – documenting that interest in body language goes as far back as the early 1800’s.

In more recent times, interest in body language first gained popularity in the early 1970s when Fast wrote the pivotal book, appropriately titled “Body Language”. Since then, it has gone on to become the topic of dozens of books and a specialty subject of psychologists around the globe.

Well-chosen language, said in the right way and with body language that is congruent, can touch the heart and soul, find a common ground, tear down walls of division, foster powerful new relationships and move people to take action. If there is lack of congruency, the receiver will be confused and will have a tendency to accept the predominant form of communication rather than simply the literal meaning or words.

For example, someone can say, “I love you very much.” However, the tone of voice can dramatically distort the meaning of these words. By placing an emphasis on different words or by “coloring” the statement with emotion rather than making it cold and distant, the meaning of these words can change significantly.

I have studied and research a bit on this topic which is available on my blog in two posts which can be visited at -

http://www.expressions-kt.in/2013/06/thoughts-we-communicate-more-than-what.html

http://www.expressions-kt.in/2013/06/thoughts-messages-people-send-without.html