^12:11
They triumphed over him
by the blood of the Lamb
and by the word of their testimony;
they did not love their lives so much
as to shrink from death.

This verse is the second stanza of the three-verse victory song. It explains the cause of Satan's removal from heaven.

"They (our brethren) TRIUMPHED over him (the accuser)

People who triumph (OVERCOME) are a major theme in Revelation. The TRIUMPHANT's reward is found in Revelation 2:10.

by the blood of the Lamb

We, believers, have no concept how powerful the BLOOD of Jesus Christ is. It is a cleansing agent (1 John 1:7,9) at the same time it is the victorious life (1 John 5:6-12)

and by the WORD of their TESTIMONY;

It is imperative for a believer to SPEAK of what Jesus Christ did for them. Check it out: Romans 10:9; Psalm 19:14; and 1 Peter 3:15. Compare this to John's view of the TESTIMONY in Revelation 1:9; Revelation 6:9; Revelation 14:12; and Revelation 20:4. That is how important SPEAKING THE WORD of TESTIMONY is.

they did not love their lives so much
as to shrink from death.

Being "completely committed" to Jesus Christ says my earthly life is not important compared to my eternal life. Jesus talked about this in Matthew 10:34-39 and Mark 13:9-13. Can you claim and speak these three things today? Why not?