The blood of the covenant is thicker than the waters of the womb.A bond made by choice will always be stronger than a bond made by happenstance.
This is the real and complete quote. I wonder where did the shortened version came from. Its meaning was completely twisted as well.
A lot of common phrases have been twisted and shortend over time. Instead of sound advice, they were turned into rules of compliance
The blood of the covenant is thicker than the waters of the womb.
A bond made by choice will always be stronger than a bond made by happenstance.