SUKhA

sanskrit word for happiness is sukha (सुख)
kha means space - open accomodating, radiant space. it can also mean a hole, like a hole in the centre of smth
and su means good.
the word sukha therefore can mean good open space in the centre of smth.
a meaning that evolved from the idea of a Chariot wheel with it's hole placed precisely in the centre
so that when it was put to use
those in The Charriot got a smooth and even ride

the word dukkha is freuently translated as suffering, but it also means a bad hole
suggesting the idea that when the hole in The Charriot wheel was misplaced
it would produce an uncomfortable bumpy ride

when practicing
if the core of our heart is not trully centered
if it's not shining forth with radiance
because we have closed it off to others
then our practice
and all aspects of our life are not

sukha

or happy

instead we are filled with suffering
because at the core of our being is the sense of dukkha
or a bad hole

if on the other hand
we have honest relationships with others
and we embrace all beings into the core of our heart
then, as we wake up into the present moment
we find that we are able to penetrate into the depths of our circumstances
and this is the beginning of great happiness

/The mirror of yoga
Richard Austin Freeman