paradox - A situation or idea that seems strange because it involves two aspects that are very different and seem to contradict each other, and both may be true.

It's a paradox that often it's the busiest people that have to most time to contribute to the needs of others.
hint - A small or subtle piece of advice, suggestion, or information, often given to help someone understand something or solve a problem.

After a difficult 30 minutes in front of the group, my manager gave me a hint on how to improve my presentation.