Every thing you trust
is a thing that can betray you.
The library. The input. The internal call.
The "it's behind the firewall, it's fine."
Trust isn't free.
It's a door you decided not to lock.
Verify at the boundary.
Assume nothing because it's internal.
The most dangerous word in a system
is "probably."
– Serguey Asael Shinder
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