Barry Goldwater, delivering a hortatory speech

Hortatory

adj. Giving exhortation or advice; encouraging; exhortatory; inciting; as, a hortatory speech.

Considering the avowed purpose of his work, which is rather hortatory than historical, we are fortunate indeed to be given so much first-hand information by this embittered preacher.
J N L Myres, in R G Collingwood and J N L Myres Roman Britain and the English Settlements (1937) p. 329

Etymology
15th century, neoclassical Latin, Hortati means “to exhort”, an intensified version of Horiri, “to urge”.