growth

A person can grow only as much as his horizon allows.  

(John Powell)

Only as high as I reach can I grow,
Only as far as I seek can I go,
Only as deep as I look can I see,
Only as much as I dream can I be.
(Karen Ravn)

What a man thinks of himself, that it is what determines, 

or rather indicates his fate.    

(Henry David Thoreau)