Today's apology

I need to apologise to the gentleman who was hard of sight, who I helped this morning.
You were perfectly happy and I offered a little assistance to you to cross a busy road. You were grateful for the help. Once across I asked where you were heading next, you said the building we were outside, the second revolving door, you then asked if I could get you to that door and I was ignorant, stupid and didn't just say 'of course' and leave it there, instead I said 'of course, I'd wondered how you'd get there'. How insulting and rude of me. You cope, and have coped for many years without the assistance of others and here I am, an ignorant person of sight judging that it must be impossible to live a "normal" life with sight difficulties. I am sorry for that short sighted comment, I should have kept it to myself and I didn't. I now know and I promise to never say such a remark to anyone else who is challenged, I have felt foolish and insulting all day and all I'd like to do is apologise to your face. So from the deepest depths of my heart, I am sorry for my comment, it wasn't meant with any ill will.