Assistance required for English to Latin translation?

I was hoping that someone can Help me with the correct English to Latin translation for the following two sentences.



Whats within matters most

and

What lies within



It will be written on a present...



I dont trust the answers from the online tools...



Many thanksAssistance required for English to Latin translation?
"Quod est intro plurimum refert." means "What is within matters most."



"Quod est intro" means "What is within". (You could translate as "What lies within".)