Atheists: Who, what or where do you receive your 'source' of love from?

Since you do not acknowledge God at all, who IS love (1 John 4:16), then what is the origin or most vital part of what you know about love and where love actually comes from? For example, where does a parent's love toward their child come from? Or where does your love for family members and fellow human beings... show more Since you do not acknowledge God at all, who IS love (1 John 4:16), then what is the origin or most vital part of what you know about love and where love actually comes from? For example, where does a parent's love toward their child come from? Or where does your love for family members and fellow human beings come from? What about love between a romantic couple? Do these all have the same source, or are they different in any way?

Considerate answers only please. And please, no crude language. Thank you.
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