Vastu Shastra is believed to have originated from the stapadya veda of Atharvana Veda. As we are know there are four vedas, Rugveda, Yajurveda, Samaveda and Atharvana Veda. Rugveda consists of hymns which are nothing but prayers to god, Yajurveda explains the different rituals and procedures to be followed in them, Samaveda is the mother of music, the seven swaras sa, ri , ga , ma , pa , da , ni are derived from Samaveda and the last one Atharvana veda or Atharva veda as is widely known preaches non violence and peace.
Unfortunately we do not have access to complete vastu shastra, As we know vedas were taught orally by the Guru to his desciple and they were never recorded. It was a custom to remember it by heart and teach it. The main idea was to avoid theft! In future they might have written it, but because of the burning of Nalanda library we lost most of our treasured knowledge.
So let us make most of the Vastu, that has been passed on from generations to generations.
Vastu tells us how to build our house, vastu tells the positive and negative energies a plot or construction will bring. How to rectify it. Just like one cannot prove the presence of god to atheist, and one should feel it to realise it, the same is true with Vastu. Once we learn Vastu, we can keep observing every house and the life of people living in it, and surprisingly you will see that things happen as per the belief of Vastu. Thus we should not take vastu lightly. Let us benefit from the wisdom our ancestors have given us.