We do not have to wait for ...

We do not have to wait for future discoveries in connection with the powers of the human mind for evidence that the mind is the greatest force known to mankind. We know, now, that any idea, aim or purpose that is fixed in the mind and held there with a will to achieve or attain its physical or material equivalent, puts into motion powers that cannot be conquered.
We do not have to wait for future discoveries in connection with the powers of the human mind for evidence that the mind is the greatest force known to mankind. We know, now, that any idea, aim or purpose that is fixed in the mind and held there with a will to achieve or attain its physical or material equivalent, puts into motion powers that cannot be conquered.

Quotes from the same author

Effort only fully releases its reward after a person refuses to quit.
Bravery is fearlessness-the absence of fear. The merest dolt may be brave because he lacks the mentality to appreciate his danger.
Fears are nothing more than a state of mind.
Ideas are the beginning points of all fortunes.
You might well remember that nothing can bring you success but yourself.