I was a block of wood, I became a firebrand.是什么意思？

I was a block of wood, I became a firebrand.

我从前是块木头, 后来成了引火的干柴.

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

block

n. 块，街区，<英>大楼，大厦，障碍物，阻碍；vt. 阻止，阻塞，限制；

例句
Two firemen were hurt in a blaze which swept through a tower block last night.
昨晚，一场大火吞噬了一座高层建筑，两位消防员被烧伤。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

wood

n. 木材，树林，木制品；vi. 收集木材；vt. 在…植树造林，给…添加木柴；adj. 木制的，失去理智的；

例句
I recently acquired some wood from a holly tree...
最近我从一棵冬青树上弄了些木料。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

firebrand

n. 火把，燃烧的木柴，放火者，煽动叛乱者；

例句
He is represented by the media as a dangerous firebrand .
新闻媒介报导，他是个危险的政治煽动者。