DHP III Cittavagga

Quivering, wavering,
hard to guard,
to hold in check:
 the mind.
The sage makes it straight —
like a fletcher,
the shaft of an arrow.

Like a fish
pulled from its home in the water
& thrown on land:
this mind flips & flaps about
 to escape Mara's sway.

Hard to hold down,
 nimble,
alighting wherever it likes:
 the mind.
Its taming is good.
The mind well-tamed
 brings ease.

So hard to see,
so very, very subtle,
alighting wherever it likes:
 the mind.
The wise should guard it.
The mind protected
 brings ease.

Wandering far,
going alone,
bodiless,
lying in a cave:
 the mind.
Those who restrain it:
 from Mara's bonds

My comments:

The mind so hard to control, like a never-ending train or the flowing rivers,the mind has no start and no ends.
The mind so hard to control and tame not b'cos its nature is so but we are too used to unrestrained control.
Just like a mud that needs crafting to be a pot.

A well restrained mind or a well trained mind is the mind of a sage, perfect like the cuts of diamond.
A well restrained mind does not mean controlling of feelings suppressed of emotions.
Its to guard the sense doors and leave no gaps for defilements.
Seeing things as it is and grows no attachments to any phenomena.
And eventually not even to be attached to the way to guard your mind.

Just observe as it comes and as it goes.