"If they could touch Jesus up close!" said the Pope three weeks ago — "Touch, but where? See, where? If they see Him in you they will say: 'My Lord and my God' like Saint Thomas."

Giussani. Is It Possible: Charity, p 84.

And here is the original, in Italian.
To the youth of the Diocese of Rome in preparation for the 9th World Youth Day (March 24, 1994).