Same with pretty much every saying that regressives steal to justify their shit.
"Blood is thicker than water" does not mean family is more important than friends. The full saying is "Blood of the covenant is thicker than the water of the womb." So it means the exact opposite.
"Spare the rod, spoil the child" is actually from a poem by Samuel Butler in the 1600s. The poem is about spanking your lover. The actual bible quote that the poem is satirizing is, "He who spares the rod hates his son, but he who loves him is diligent to discipline him." Nuanced difference, but doesn't advocate beating the same way the shortened one does.