You have a determination that inspires me.
'Determinazione' = de-ter-mi-na-ZIO-ne. 'Ispira' = i-SPI-ra.
Use this when someone's persistence, commitment, and drive has impressed or motivated you. It acknowledges that their quality has had a direct positive effect on you — making the compliment reciprocal and personal.
'Che mi ispira' is a relative clause: 'that inspires me'. 'Ispirarsi' means to be inspired; 'ispirare qualcuno' means to inspire someone. The construction 'hai una X che mi Y' (you have an X that Y-s me) is elegant and precise.
Non ti arrendi mai. Questo mi motiva.
You never give up. That motivates me.
Behavioural description — never giving up as inspiring
La tua tenacia è ammirevole.
Your tenacity is admirable.
'Tenacia' (tenacity) — a slightly formal term for stubborn persistence
Sei la persona più motivata che conosca.
You are the most motivated person I know.
Superlative — placing them first among all known people
Italian culture celebrates the concept of 'farcela' (making it / succeeding against odds). Stories of people who struggled and succeeded through determination are culturally beloved. The Italian word 'grinta' (grit, fighting spirit) is used with admiration for those who never give up. Sport, business, and art are all arenas where 'grinta' is valued.