Questions: A passage I don't understand

• 1 John 5:6 (ESV)
• 1 John 5:7 (ESV)
• 1 John 5:8 (ESV)
• 1 John 5:9 (ESV)
• 1 John 5:10 (ESV)
• 1 John 5:11 (ESV)
• 1 John 5:12 (ESV)
• 1 John 5:13 (ESV)
• 1 John 5:14 (ESV)
• 1 John 5:15 (ESV)
• 1 John 5:16 (ESV)
• 1 John 5:17 (ESV)
• 1 John 5:18 (ESV)
• 1 John 5:19 (ESV)
• 1 John 5:20 (ESV)
• 1 John 5:21 (ESV)

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What does John mean when he says "there are three that testify: the Spirit and the water and the blood"? And what is the difference between a sin that leads to death and one that does not? Why are we not to pray for sins that lead to death?

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