"Then one of the elders said to me, Do not weep! See, the Lion of the tribe of Judah, the Root of David, has triumphed. He is able to open the scroll and its seven seals."
Jesus Christ, as the Lion, conquered sin and death so that we could share in the glory of his eternal kingdom. This victory was made possible through his work on the cross, in which he stepped in as the innocent Lamb to be sacrificed for our sin once and for all.
Therefore, in the Lion, we discover the power of Christ as an eternal king, and in the Lamb, we find the grace of Jesus as an Eternal Saviour.