Have you ever heard the phrase “train like a white belt?” It doesn’t mean that you should forget everything you know, wear gis that don’t fit you correctly and bruise more than usual. It means to train with no ego. No matter the belt color around your waist, you should always be open to knowledge and understand that you can learn things from everyone, and you should!
But we’ll get Gracie Barra leader Vinicius “Draculino” Magalhaes speak to you about it instead:
I think you're missing the word "No": "It means to train with an ego".