These have all helped me at various times.
Make mistakes of ambition and not mistakes of sloth.
Niccolo Machiavelli
Progress lies not in enhancing what is, but in advancing toward what will be.
Khalil Gibran
Don’t undertake a project unless it is manifestly important and nearly impossible.
Edwin Land
A young man without ambition is an old man waiting to be.
Steven Brust
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Mike Crittenden 