On whom people stumble?

What is stumbling?

Why and on whom do people stumble? How dangerous it is to have a high position, but be a «low» person?

«Now the sons of Eli were sons of Belial; they knew not the LORD. And the priests’ custom with the people was…
Wherefore the sin of the young men was very great before the LORD: for men abhorred the offering of the LORD.  «(1 Samuel 2: 12,17)

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