Proverbs 14:10 The heart knoweth his own bitterness; and a stranger doth not intermeddle with his joy.
We see in this scripture that the feelings of the heart are private. Whenever we are grieving it is difficult for someone to really feel what is in our heart and if it is of a personal nature it is usually deeper than the onlookers. Also we can share our joy with anyone but it is hard to feel the greatness of it if it is not happening to us. We should however never let anyone hinder our joy and if we take those things that grieve us to God , He will give us the strength and comfort to get through any situation and He is the supplier of our joy.