Just seen at Explorer, this thought from Neil Tyson:
Whether or not you can never become great at something, you can always become better at it,
…don’t ever forget that!
And don’t say “I’ll never be good”. You can become better! and one day you’ll wake up and you’ll find out how good you actually became.
Puts me in mind of the thought from Emerson used as a tag line by John Zimmer at Manner of Speaking:
All the great speakers were bad speakers at first.