'To roar like a lion,' as in Isaiah 31:4, which refers to Jehovah, signifies the ardent affection of defending heaven and the church against evils and falsities. In an opposite sense, 'the roaring of a lion' signifies the desire to destroy and desolate. A lion roars when it sees its enemies and is attacked by them, and when it sees its young or its prey carried off. The same is comparatively the case with the Lord when He sees His church carried off by devils.

(Odkazy: Apocalypse Explained 10 [3], 278, 304; Revelation 3, 10, Revelation 10:3; The Apocalypse Explained 605)