I don't believe there's any one statement that constitutes the "Lion's Roar".The Lion's Roar - Two Discourses of the Buddhahttp://www.accesstoinsight.org/lib/auth ... el390.html
The Pali Commentaries explain that there are two kinds of lion's roar: that of the Buddha himself and that of his disciples. The former is sounded when the Buddha extols his own attainments or proclaims the potency of the doctrine he has realized; the latter, when accomplished disciples testify to their own achievement of the final goal, the fruit of arahantship. Viewed in the light of this distinction, the Shorter Discourse on the Lion's Roar exhibits a hybrid character, being a sutta spoken by the Buddha to instruct his disciples how they should affirm, in discussions with others who hold different convictions, the singular greatness of the Teaching.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)