as far as i can tell it seems to be a misquote or maybe a lost in translation moment from italian to english in then Pope John Paul II's inauguration speech.
and as far as the interweb is concerned that is "saint" Pope John Paul II'nd's handwriting
here is the part of the speech it is from, 10/22/1978
"5. Brothers and sisters, do not be afraid to welcome Christ and accept his power. Help the Pope and all those who wish to serve Christ and with Christ's power to serve the human person and the whole of mankind. Do not be afraid. Open wide the doors for Christ. To his saving power open the boundaries of States, economic and political systems, the vast fields of culture, civilization and development. Do not be afraid. Christ knows "what is in man". He alone knows it."
http://www.vatican.va/content/john-paul-ii/en/homilies/1978/documents/hf_jp-ii_hom_19781022_inizio-pontificato.html