From Self-Development and the Way to Power, by L. W. Rogers (22)

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One of the things we have to learn is to overcome the inertia of the
physical body and many people are not really awake on the physical
plane because they have not done so. To a certain extent they are
"dead" within the physical body for it is a condition much nearer
death than that supposed death of one who no longer has the physical
body. The inert mass of physical matter in which such people are
functioning leaves them only half alive until they have aroused
themselves from its domination. They remind one of the lines:

"Life is a mystery, death is a doubt,
And some folks are dead
While they're walking about!"

This inertia of the physical body that so often renders people nearly
useless is very largely a matter of habit and can be overcome to a
surprising degree by simply using a little will-power. Everybody is
familiar with the fact that it is sometimes much easier to think and
act than at other times. But perhaps it is not so well known that the
dull periods can invariably be overcome by an effort of the will and
the physical body be made to do its proper work. An actor or lecturer
after months of continuous work may find the brain and body growing
tired and dull. He may feel when going before his audience that he has
not an idea nor the wit to express it were someone else to furnish it.
Yet by an effort of the will he can quickly overcome the condition and
change from stupidity to mental alertness and intensity of thought.
The self is never tired. It is only the physical body that grows
weary. It is true that it has its limitations and must not be
overtaxed and driven beyond endurance as a tired horse is sometimes
cruelly urged forward with whip and spur. Judgment must always be used
in determining one's capacity for work. But that which is to be done
should never be done draggingly, with the inertia of the physical body
marring the work. We should be fully awake instead of "dead" while we
"are walking about." If a person resolves to be the master of the body
he may soon acquire the power to arouse it to activity and alertness
during all his waking hours, very much as one may acquire the habit of
keen observation and be conscious of what is occurring in his vicinity
instead of being carelessly unconscious of the major portion of what
is going on immediately about him.