If one holds himself dear,
one should diligently watch himself.
Let the wise man keep vigil,
during any of the three watches of the night*.

~Dharmapada 157~

be aware of your mind.
be aware of what it is doing,
where it is...

be a master of your mind, not slave to it... control it, and let not it control you...


*the three watches means youth, middle age and old age...