This little poem comes from Disticha de Educatione of Urbano Appendini, published in 1834; you can see the whole book at Google Books.
Ut Ira Desinet
Irato responsa viro da mollia et, omnis
Si vis extemplo desinat ira, tace.
The vocabulary is keyed to the DCC Latin Vocabulary list. There is only one word in this poem that is not on the DCC list:
extemplō: immediately, quickly
rēsponsum (rēsponsī, n.): answer, reply
dēsinō -sinere -sīvī -situm: leave off, cease
dō dare dedī datum: give
et: and
īra irae f.: wrath, anger
īrāscor īrāscī irātus sum: grow angry; īrātus -a -um: angry
mollis -e: soft, yielding, gentle
omnis -e: all, every, as a whole
sī: if
taceō -ēre -uī -itum: be silent; tacitus -a -um, silent
vir virī m.: man
volō velle voluī: wish, be willing
