"A heavy burden is lightened if everyone participates in carrying it."
-This simply means that we should learn to open up our problems more to those we could trust and to those who we can say could help us. We shouldn't keep them all to ourselves because sometimes problems can consume our whole being. Depression, loneliness, and all those negative feelings will always be within you if you wont learn to open up.
And when the time comes that you do would open up, surely, a heavy part within you heart is lifted. You would feel light since there are people who really listens and cares for you.
Hope this helps! :)