。
Summon your courage and tell the truth.
Literal
Courage [object-を] rouse-up-and truth [possessive-の] thing [object-を] say-[imperative-なさい].
奮い起こす (ふるいおこす, 'to rouse, summon up') is a vivid compound verb — 奮う ('to muster') + 起こす ('to raise'). The te-form connects the summoning of courage to the act of speaking, implying the first enables the second.