Ne Rumperer
Consilio moderato animos frenato furentes,
Ut rigidas quercus vimina lenta solent.

Here is the vocabulary:
ne - so that not, lest
rumpo - burst
consilium - purpose, plan, advice
modero - control, check, slow down
animus - spirit, mind
freno - bridle, curb, restrain
furo - rave, rage, be wild
ut - as
rigidus - stiff, hard, stern
quercus - oak
vimen - twig, shoot
lentus - clinging, tough, pliant
soleo - be in the habit of, be accustomed to