A few Gruks

Below is a few of Piet Hein's "Grooks", as his poems were known.
He wrote in several languages.

T.T.T
Put up in a place
where it's easy to see
the cryptic admonishment
    T.T.T.
When you feel how depressingly
slowly you climb,
it's well to remember that
    Things Take Time.
NAIVE
Naive you are
if you believe
life favours those
who aren't naive.
PROBLEMS
Problems worthy
    of attack
prove their worth
    by hitting back.
THE ROAD TO WISDOM
The road to wisdom? - Well, it's plain
and simple to express:
    Err
    and err
    and err again
    but less
    and less
    and less.
A PSYCHOLOGICAL TIP
Whenever you're called on to make up your mind,
    and you're hampered by not having any,
the best way to solve the dilemma, you'll find,
    is simply by spinning a penny.
No - not so that chance shall decide the affair
    while you're passively standing there moping;
but the moment the penny is up in the air,
    you suddenly know what you're hoping
ARS BREVIS
There is
one art,
no more,
no less:
to do
all things
with art-
lessness

AN ETHICAL GROOK
I see
  and I hear
    and I speak no evil;
I carry
  no malice
    within my breast;
yet quite without
  wishing
    a man to the Devil
one may be
  permitted
    to hope for the best.
A WORD TO THE WISE
Let the world pass in its time-ridden race;
    never get caught in its snare.
Remember, the only acceptable case
for being in any particular place
    is having no business there.

MEETING THE EYE
You'll probably find
    that it suits your book
to be a bit cleverer
    than you look.

Observe that the easiest
    method by far
is to look a bit stupider
    than you are.

LIVING IS -
Living is
    a thing you do
now or never -
    which do you?