Brent was carrying his ill daughter when a man yelled at them, telling him to let her walk.
For Brent, that was a good opportunity to open someone's eyes about unconditional love.
In a now viral Facebook post, Brent shared how he dealt with the rude man.
Brent said the incident happened while he and his daughter were leaving a restaurant in Boston.
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"When I crossed the street carrying her, she can't walk without the use of her walker. A man yelled at me from 30 [meters away]: 'What the [expletive]? He yelled. 'Make her walk. That's what is wrong with kids today'," he recalled.
Brent said he had two choices at that time: to scream back at the rude man or to be calm and teach him something about life.
He chose the latter one. He wrote: "I responded with 'My daughter has been carrying my faith and my strength for the past 6 years since she was diagnosed with a brain tumor. She can't walk but I am happy to carry her because of all the amazing things she has taught me through the years. So I would advise you not [to] address my daughter in any way other than respectful."
AN EMOTIONAL ENCOUNTER
Brent said this encounter brought him and the other man to tears. He was able to change the other man's perspective. Brent opened the stranger's eyes to the beauty of unconditional love.
"This story is only important if it serves as a reminder that you don't always know the whole story so don't judge others," Brent wrote.
He then ended his note with a tribute to his sick daughter, who would soon undergo another round of chemotherapy treatment.
"I promise you this through hell and high water Emma has made each and every day of my life a blessing. I praise God for bringing her into my life. Emma, you are perfect just as you are and we will help carry you through chemo #7," he wrote.