Various, Notes and Queries, Number 184, May 7…
“ Whilst there is this difference between the Greek and Latin sign of the cross when made upon oneself, there is also a difference between the two when made upon others. The Latin Benediction is given with the thumb and the first two fingers open; the third and fourth fingers remaining closed. This arrangement of the the fingers is symbolical of the Trinity: the three open fingers signifying the three divine persons, and the two closed fingers being emblematic of the two natures of Christ. ”
