Officiosa Aliis, Exitiosa Suis
Hostis aperte, ast clam falsus, nos perdit amicus,
Nec quisquam est structis tutus ab insidiis.

Here is the vocabulary:
officiosus - attentive, dutiful
alius - other, another
exitiosus - deadly, destructive
suus - reflexive possessive
hostis - enemy
aperte - openly
ast - but, on the other hand
clam - secretly
falsus - lying, false
nos - we, us,
perdo - ruin, destroy
amicus - friend
nec - and not, nor
quisquam - anybody, anyone
sum - be, exist
struo - construct, build
tutus - safe, secure
ab - from
insidiae - ambush, trap