Srila Prabhupada once told some devotees who were taking second initiation that if a mother holds her baby on her lap and that child passes stool, she will immediately overlook it. A mother is tolerant with a young child. But if the mother is holding a nine-year old on her lap and the child passes stool, the mother is not so tolerant. Prabhupada gave this example to show the responsibility of growing up in Krishna consciousness and taking brahminical initiation.
LFD Vol 2 Pg 380 2nd Paragraph