The opinion of the power of obstacles to the acquisition of knowledge is, to an ardent lover of knowledge, more imaginary than real.

XXXI.

(2 A)

Obstacles to the acquisition of knowledge are:

1. Want of means.

2. Want of time; from

1. Worldly occupations.
2. Shortness of life.

3. Opposition; of

1. Ignorance.

2. Prejudice.

Want of Means.

XXXII.

The study of experimental philosophy is attended with expense.

XXXIII.

(2 B)

The study of human nature is not attended with the expense of experimental philosophy. (2 C)

The magnitude of the obstacle to the acquisition of knowledge from worldly occupation is generally over-estimated.

(2 G)

Shortness of Life.

XXXVI.

Notwithstanding the shortness of life, much may be done by any student who steadily pursues his object. (2 G)

XXXVII.

The obstacle from the shortness of life may be counteracted by the consciousness that "no labour is lost," and that a discovered truth will flourish in future ages. (2 H)

Do not waste time by ignorance of existing inventions.

XLVI.

(2 R)

Save time by contracting the inquiry within narrow limits.

XLVII.

(2 S)

The resistance of ignorance and prejudice has a temporary effect in retarding the progress of knowledge.

(2 T)