Quote: If they started having convulsions, they were saved.
What by - a paramedic?
My older kids have all spontaneously started rejoicing their saving precisely inline with the time, they respectively began to fully understand they concept of the crucifixion. Between ages 6 and 9.
They understand other related aspects at younger ages, but that is like the final jigsaw piece for them when the enormity of the'giving' and sacrifice' made for them penny drops fully...