There Is No Substitute For Hard Work.

X-rays ... I Am Afraid Of Them. I Stopped Experimenting With Them Two Years Ago, When I Came Near To Losing My Eyesight And Dally, My Assistant Practically Lost The Use Of Both Of His Arms.

The Three Things That Are Most Essential To Achievement Are Common Sense, Hard Work And Stick-to-it-iv-ness... Unfortunately, Many Of Life's Failures Are Experienced By People Who Did Not Realize How Close They Were To Success When They Gave Up. I Have Far More Respect For The Person With A Single Idea Who Gets There Than For The Person With A Thousand Ideas Who Does Nothing.

Many Of Life's Failures Are People Who Did Not Realize How Close They Were To Success When They Gave Up.

I Never Once Made A Discovery ... I Speak Without Exaggeration That I Have Constructed Three Thousand Different Theories In Connection With The Electric Light ... Yet In Only Two Cases Did My Experiments Prove The Truth Of My Theory.

I Would Construct And Work Along Various Lines Until I Found Them Untenable. When One Theory Was Discarded, I Developed Another At Once. I Realized Very Early That This Was The Only Possible Way For Me To Work Out All The Problems.