Jesus Christ has always been the champion of the poor, the downtrodden and the oppressed. At the time this gospel was written, there was no middle class to speak of that would bridge the elite class and the poor. The elite had everything including access to the churches but the poor had practically nothing.
Fast forward to the 21st century and although there is already a middle class, the elite still owns almost everything while the poor still suffer. Look around and the great divide is still evident.
Though it is not a sin to be rich and endowed, sharing of resources to the poor is expected of us. Sharing could be in the form of giving them equal opportunities and opening doors for them to uplift them from their present predicament.
This gospel is about hope. Jesus is assuring us that there is something better to look up to in His kingdom. Whatever suffering we have endured or are enduring on earth will be rewarded in the afterlife. Heaven is one great equalizer: both rich and poor have equal chances of entering His gate.