I think the meaning is a bit deeper and broader, expressing some really general doubts about faith and about how the author lives his life, especially if he is leading others. "Can I be used to help others find truth if I'm scared I'll find proof that it's a lie?" It's also about repentance and pleading for God's patience: "Please give me time to decipher the signs, please forgive me for time that I've wasted..." And in the end, it's about what it says:
"I'm a doubting Thomas
I'll take your promise
Though I know nothing's safe."
I think the meaning is a bit deeper and broader, expressing some really general doubts about faith and about how the author lives his life, especially if he is leading others. "Can I be used to help others find truth if I'm scared I'll find proof that it's a lie?" It's also about repentance and pleading for God's patience: "Please give me time to decipher the signs, please forgive me for time that I've wasted..." And in the end, it's about what it says:
"I'm a doubting Thomas I'll take your promise Though I know nothing's safe."