Man is made or unmade by himself.
In the armoury of thought he forges the weapons
which he destroys himself.
He also
fashions the tools with which he builds himself heavenly mansions of joy,
strength and peace.
By the right choice and true application of thought,
man ascends to the divine perfection.
By the abuse and wrong application of thought, he descends below the level of
beast.
- James Allen in As a Man Thinketh.