Love
Love is a feelings which cannot be explained in words, cannot be shown, sometimes cannot be told but it exists inside of our mind core.Sometimes you feel it but cannot realize it, sometimes you may realize but cannot tell and sometimes you live within it but do not know till loved one get away from you to far away.
It is such kind of feelings which let you down and could be make you the stronger one. It's live within you and you just need to feel it and believe.