How secure is to open ports from inside the firewall?

Hello list.

One silly question: How secure is to open ports from inside the firewall?

Ok, closing incoming ports is the purpose of a firewall. But what about the outgoing? Could this make someone's life who already broke into the network easier? Or is it already too late, and that someone if already in can use just any open port to send traffic out?

Please let me know your views.

Joseph





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