Because you asked the same in another forum, I'll give my answer here as well
(because here are more people who could correct it)
áit a bhfuil toil tá bealachVerbatim "Where’s a wish there's a way"
So in this dictionary:
http://www.focloir.ie/en/dictionary/ei/where#where__11tnúth a threabhasSo here in Ó Dónaill’s dictionary:
http://www.teanglann.ie/en/fgb/threabhasLiterally probably: "Expectation/desire ploughs"
fonn a níos fiachSo as well in Ó Dónaill’s dictionary:
http://www.teanglann.ie/en/fgb/fonnLiterally probably: It’s a wish that makes hunt
fonn a dhéanas fiachSo in de Bhaldraithe’s dictionary:
http://www.teanglann.ie/en/eid/willSame as above, but different form for "(that) makes"
Most of them don't suit well for alteration, except "áit a bhfuil toil tá bealach".
Áit a bhfuil toil tá bealach. = Where there’s a will there’s a way.
Áit a bhfuil bealach tá aidhm. = Where there’s a way there’s a goal.
Áit a bhfuil aidhm tá toil. =Where there’s a goal there’s a will.