To back up one's words with corresponding actions

You said you would help me, but I had to hire someone else because, as usual, you talk the talk but don't walk the walk

Mi avevi detto che mi avresti aiutato, ma ho dovuto chiamare un aiuto esterno perché, come al solito, parli bene ma poi non passi ai fatti

You can trust Joe. He'd rather walk the walk rather than talk the talk

Gianni è un uomo d'azione più che di parole. Puoi fidarti di lui

You can sure talk the talk, but can you walk the walk?

A parole sei bravo, ma poi a fatti?

This is a 20th century US alternative to several old sayings which embody the notion that “talking is cheap”