The gift of a lifetime.

Stefun Darts – a Houston native, college students and founder of non-profit Caring Heart Youth – repaid his grandparents for everything they’ve done for him by gifting them with a $15,000 check and a trip to the Bahamas.

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“I promised God in the second grade I would pay off you guys house and help you retire. A promise I would never break,” Darts, 24, wrote on Facebook. “The best and most beautiful things in the world cannot be seen, nor touched but are felt by the heart.

“Even with this, I could never repay you for what you’ve done for me,” the San Jacinto College student said. “I sacrificed my teenage and early adulthood of not having fun for this moment. I couldn’t stand you going to work at night, some nights I didn’t even sleep knowing it shouldn’t be like this. Never have I wrote a check wanting this to be the first one. To all my friends that stood by me over these last 6 years I appreciate you.”

According to local CBS affiliate KHOU, Darts saved the money by eating microwave pizza and opting to not go out with friends in order to save the money for Marilyn and Cecil Roberts who have been making mortgage payments for over 20 years.

“While many teenagers are partying and having fun I had to sacrifice, and finally this Sunday on March 20th, 2016 at 4:00 p.m.,” Darts told PEOPLE in a statement. “I will experience tears of joy by handing them a check paying off their house so they can retire from work.”

Had their grandson not stepped in, they would have continued to pay for another four years, the network reports.

“I couldn’t believe it,” Marilyn said, Darts’ grandmother told KHOU. “To have a grandson like that is a blessing.”

Lifting the burden of a mortgage payment wasn’t the only thing Darts gave his grandparents. He also bought them tickets to the Bahamas.

“Somethings were never said and I’m glad you guys had enough sense to understand I had something greater to complete,” he continued on Facebook. “Tale this check and pay your house off, and retire from work. Y’all owe no man but God. Even copped y’all some tickets to the Bahamas.”