Literally this means that he who enjoys the benefit ought also to bear the burden, he who enjoys the advantage of a right should also take the accompanying disadvantage. In other words, a privilege is subject to its conditions.
This is most commonly encountered in the case of covenants relating to land. The general rule is that the burden of a positive covenant does not run with the land. Whilst a covenant requiring the expenditure of money or the doing of some positive act is binding upon the person who originally enters into the covenant, it is not binding upon successors in title.
The rule that he who enjoys the benefit, ought also to bear the burden is the exception to this. A typical case would be one where parties granted rights to use a road owned by a third party had agreed to make payments towards its upkeep. The obligation to make payments is a positive obligation, but will be binding on successors in title in the event that they wish to use the road.