Compare the moderate amount of energy expended in uttering the narrative clauses "cried Francis," "and he rose from where he sat," and "quoth he," which should be read with moderate force.
More physical energy is expended in making one's self understood at a distance than near at hand, and in addressing a large audience than a small one; hence strong force is used in the following where it is accompanied by a loud tone of voice:
"Come back, come back Horatius!" Loud cried the Fathers all.
But strong force does not necessarily imply a loud tone of voice:
"Curse on him!" quoth false Sextus; "Will not the villain drown? But for this stay, ere close of day We should have sacked the town!"
Here Sextus gives vent to his concentrated hate for Horatius and speaks with strong force, but not in a loud tone of voice.
The effort to influence the mind and action of others draws on a great fund of mental energy; hence commands, persuasion, and argument, all find their vocal expression in strong force. Hervé Riel, urging the captains to allow him to pilot the ships, speaks with strong force:
Sirs, they know I speak the truth! Sirs, believe me there's a way!
Only let me lead the line,
When the mental or physical energy is at a low ebb we speak with weak force: