JMNT(i)
11 Consider (or: See)
how large [
are the]
letters [i.e., of the alphabet] [
which]
I write to you, in (or: by; with)
my [
own]
hand! [comment: Paul is doing this to make his point, i.e., he is “shouting” at them via the script, so that they will take note of the point he is making]