The Danger of Intellectual Ambition

The warning that cultivating thoughts and reading books beyond one's capacity can lead to unhappiness and isolation, and that for most people, a wholesome, practical life is preferable to metaphysical speculation.

The preface explicitly warns against pursuing thoughts and books beyond one's capacity, which leads to isolation and unhappiness.

Rutherford's intellectual questioning and the tension between his scholarly pursuits and his ministerial duties.