How does Buddhadharma help people with terminal illnesses?

If a person doesn't believe in religion, doesn't believe in Buddhism, then even if their physical body does not suffer, mentally they have no sense of security. When death is inevitable...

What does meditative concentration feel like, and what kind of wisdom is generated?

We can practice Chan by first calming ourselves down internally, keeping our mind simple and free of wandering thoughts and focusing it on just one thought. 

A Mind at Peace; A Life at Peace