If acts of kindness prove in any way the fulfillment of Jeremiah 31, then acts of evil certainly disprove it.
The assertion that people know what is good and what is evil, and still choose to do evil is far from being universally accepted.
Socrates, for example, claimed that: "
If one knows the good, one will always do the good. It follows, then, that
anyone who does anything wrong doesn't really know what the good is."
I come across many people who do bad things because they truly believe that what you're doing is good.
So unless you demonstrate that everyone knows exactly what good is, you cannot even come close to claim that any part of Jeremiah 31 was fulfilled.
I don't know what sort of god you believe in. But I cannot accept the obnoxious idea that, for example, a homosexual lifestyle is in any way sinful. Or that slavery is OK. But that is what the Biblical God would want us to believe. Which means that the Biblical God cannot possibly be the loving and benevolent God that (supposedly) governs the world.
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Natural Philosophy of Life offers a simple, elegant, and powerful alternative to religious dogma. This philosophy has a firm foundation in nature, science, and reason, and it is centered on the core values of honesty, generosity, equality, and freedom.