Thank you for your profound meataphysical inquiry.
Just look around and know it is so. We seldom lose our keys really; they usually turn out to have been placed somewhere we forgot about.
Negligence is forgetfulness and out of this most of us are born. We forgot to love and procreation just happened.
Many resources develop this line of exploration. If you lived in my area I would invite you to take a look in my library so that you might deepen your own thoughts on this spiritual reality with the help of another couple of thousand thinkers deeply concerned about our collective amnesis.