Note 8 — Chapter XIX · INVASION OF PORTUGAL BY MARSHAL SOULT.
Reading edition
The matter is of more importance than may be immediately perceived by a protestant. For more than three of these nails are shown as relics in different churches; and, therefore, if only three, according to the prevailing opinion, were used, the fourth must be spurious, and thus, as all cannot be genuine, a doubt would be cast upon the authenticity of each.