The most beneficial exercise, as a rule, is that which stimulates the

heart and lungs, such as running, rapid walking, hill-climbing and
swimming
The most beneficial exercise, as a rule, is that which stimulates the
heart and lungs, such as running, rapid walking, hill-climbing and
swimming. These should, of course, be graduated in intensity with
varying age and varying degrees of vitality.

The last subject of the First Book is VIRTUE

The last subject of the First Book is VIRTUE. The definition of virtue
is "_the doing good to mankind, in obedience to the will of God, and
for the sake of everlasting happiness_."

The more types of imagery into which we can put our thought, the more

fully is it ours and the better our images
The more types of imagery into which we can put our thought, the more
fully is it ours and the better our images. The spelling lesson needs
not only to be taken in through the eye, that we may retain a visual
image of the words, but also to be recited orally, so that the ear may
furnish an auditory image, and the organs of speech a motor image of the
correct forms. It needs also to be written, and thus given into the
keeping of the hand, which finally needs most of all to know and retain
it.