through/by

It is only through/by hard work that we are able to achieve success.

Which word in bold should I use?

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There's no words in bold, T, at least not on my screen.

I'd say that 'through' would be more common here but there is a phrase,

'by dint of hard work' that would work.

Results 1 - 10 of about 24,400 English pages for "by dint of hard work"

dint of hard work<br /> http://www.google.com/search?hl=en&amp;as_q=&amp;as_epq=by+dint+of+hard+work&amp;as_oq=&amp;as_eq=&amp;num=10&amp;lr=lang_en&amp;as_filetype=&amp;ft=i&amp;as_sitesearch=&amp;as_qdr=all&amp;as_rights=&amp;as_occt=any&amp;cr=&amp;as_nlo=&amp;as_nhi=&amp;safe=images

I obviously don't know how this URL thingy works.