

I would recommend starting with the gospels (the first books in the new testament: Matthew, Mark, Luke and John).
About the feeling of unease, I think it’s natural. I am uneasy when confronted with my own failure. That’s life, a journey with many hurdles to be overcome, many of them my own shortcomings. But I want to be better. So I need to acknowledge my faults.
This also shows what love means. If I were perfect, it would not be hard to love me. But the people that love me do so despite my failures. So does God. And that makes love truly valuable.
Letter from Paul to the Romans 5:6-11 NIVUK
[6] You see, at just the right time, when we were still powerless, Christ died for the ungodly. [7] Very rarely will anyone die for a righteous person, though for a good person someone might possibly dare to die. [8] But God demonstrates his own love for us in this: while we were still sinners, Christ died for us. [9] Since we have now been justified by his blood, how much more shall we be saved from God’s wrath through him! [10] For if, while we were God’s enemies, we were reconciled to him through the death of his Son, how much more, having been reconciled, shall we be saved through his life! [11] Not only is this so, but we also boast in God through our Lord Jesus Christ, through whom we have now received reconciliation.
Carpentry. And I don’t think it’s that old. The shape is so similar to modern carpentry hammers, that I think it is not older than the standardised nail. Most definitely younger than the middle ages.