some sarcastic remarks also are a form of bad karma. When one
encountered bad experience, let bygones be bygones, and if always
harping on these bad experiences, it not only does no harm to other
party mistreated you, but bad karma are developing over and over
again. Which means your blessings keep on diminishing. Invisible to
naked eyes does not mean emptiness, gods and ghost are invisible,
but it existed, we did not see our ancestors but it did exist, the
words we uttered were invisible, the thoughts arises were also
invisible :) Life is joy if you just bring out joy