sadness & pain does not exist?

The statement made in #Bereshit 1:31; "God saw all that He had made, and behold, it was very good". Is understood by many commentators as to be in reference to man's creation on the sixth day. Meaning the entire reality created for man by Gd is to express Gd's goodness; sadness and pain are temporary illusions. If a person is unaware of this torah idea it's so easy 2 focus on the negativity in life. Helen Keller has an amazing outlook not on the pasuk but the overall idea itself, she says; "When one door of happiness closes, another opens; but often we look so long at the closed door that we do not see the one which has been opened for us". Every disappointment is guaranteed to lead us too a happy outcome beyond our imagination.