Be an optimist -- at least until they start moving animals in pairs to Cape Canaveral.

Be an optimist -- at least until they start moving animals in pairs to Cape Canaveral.

The only limit to our realization of tomorrow will be our doubts of today.

The only limit to our realization of tomorrow will be our doubts of today.

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

Teaching is the greatest act of optimism

Teaching is the greatest act of optimism

The optimist sees the rose and not its thorns; the pessimist stares at the thorns, oblivious to the rose

The optimist sees the rose and not its thorns; the pessimist stares at the thorns, oblivious to the rose

Having a positive mental attitude is asking how something can be done rather than saying it can't be done.

Having a positive mental attitude is asking how something can be done rather than saying it can't be done.

I'm a pessimist because of intelligence, but an optimist because of will

I'm a pessimist because of intelligence, but an optimist because of will

So of cheerfulness, or a good temper, the more it is spent, the more of it remains.

So of cheerfulness, or a good temper, the more it is spent, the more of it remains.

Optimism is essential to achievement and it is also the foundation of courage and true progress.

Optimism is essential to achievement and it is also the foundation of courage and true progress.