He did not say, "I am the custom."

I have come across this quote a few times recently, but I am not sure what it means. Anyone know how to interpret it?

'Christ said, “I am the Truth”; he did not say “I am the custom.” ’ St. Toribio

If you do an internet search to find out the context of the quote, you will find this:
In 1581 Toribio arrived in Lima as Archbishop, dedicating himself with all his power to the spiritual well-being of his people. His diocese was in serious spiritual decay; the Spanish conquisadors committed many flagrant abuses against the native population. Many priests excused the evils, saying “It is the custom.” The archbishop responded to them that “Christ said ‘I am the Truth,’ not the custom.”

Thank you, Sunbreak!

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