Our imagination is the only limit
to what we can hope to have in the future.
Charles F. Kettering
The greatest inspiration is often born of desperation.
the proverb shown below is probably what inspired the above quote, even though it isn't listed as such - but just in case you have any doubts .....
Necessity is the mother of invention
I really like this one too - makes you remember you can't be "all fluff"
To reach a great height a person needs to have great depth.