1997 Honda Accord ABS light

Hi, I recently bought a used 1997 Honda Accord. Even during the test drive the ABS light has remained on ALL the time. I contacted the dealership mechanic who told me that the light is supposed to go off short after starting it. When I explained that htis light never goes off but has been on since before I even purchased the car he told me that technically it should go off but it's not a big deal that it doesn't. He further advised me that the ABS light will not affect my breaks and that it's probably jut a glitch. I'm wondering if this is valid advise or if it's something I should have looked at sooner rather than later. I had thought the light being on meant that the ABS was in working oder. Now I can't help but wonder if it's faulty all together and when I'll finally need my ABS hey won't funciton. Please let me know what you think I should do.

Thanks!