From Self-Development and the Way to Power, by L. W. Rogers (17)

The second requisite is a firm will. It should not be forgotten that
an unusual and difficult thing is being attempted in which a person of
weak will cannot possibly hope to succeed. Even in the ordinary life
of the world considerable will power is essential to success. To
succeed in business, to become expert in a profession, or to
completely master an art, requires strong will, determination,
perseverance. The difficulties in occult development are still greater
and, while it is true that any degree of effort is well worth while,
the weaklings will not go far. Only those with the indomitable will
that knows neither surrender nor compromise may hope for a large
measure of success. Once the will is thoroughly aroused and brought
into action every hindrance in the way will be swept aside.

"The human will, that force unseen,
The offspring of a deathless soul,
Can hew a way to any goal
Tho' walls of granite intervene.

* * * * *

"Be not impatient of delay,
But wait as one who understands.
When spirit rises and commands
The gods are ready to obey."