Visionary vs Liar

The visionary lies to himself,

the liar only to others.

- Friedrich Nietzsche

Comments

can somebody explain this for me if it rings a bell. I have a feeling there is great truth in this, however unable to decipher it.
Sandman, thanks for the light. I do agree.
Also, I perceive it more as the visionary being more harmful than the liar, since he is fooling himself. The liar, though fools others with his lies, knows the truth

But the most persistant conversation I encounter within is: am I a visionary or a liar in any given instant.