The Power to Control : Mental Suggestion — J.G. Leonard — 1905

The Power to Control: Mental Suggestion is an early 20th-century guide to mental influence, self-mastery, and the use of suggestion as a tool for shaping behavior and outcomes. J. G. Leonard presents suggestion as a natural psychological force that operates continuously—whether consciously directed or not—and argues that learning to control it is key to personal power.

At its core, the book teaches that control begins within: before one can influence others or circumstances, one must first master their own thoughts, emotions, and reactions.

Core Themes

1. Suggestion as a Universal Force
Leonard explains that suggestion is always at work—through words, tone, environment, and internal dialogue. People are constantly influencing and being influenced, often unconsciously.

2. Self-Suggestion (Autosuggestion)
A major focus is on directing suggestion inward. By repeatedly impressing the mind with chosen ideas—confidence, calm, success—individuals can reshape habits, attitudes, and responses.

3. Control of Others Through Presence and Language
The book also explores how suggestion can be used in interactions. Clear, confident communication and strong mental intention are said to increase one’s ability to influence others’ perceptions and decisions.

4. The Importance of Confidence and Authority
Leonard emphasizes that suggestion is strengthened by the operator’s certainty and composure. Hesitation weakens influence, while conviction amplifies it.

5. Emotional and Mental Discipline
Control is framed as the ability to remain steady regardless of external circumstances. Emotional reactivity undermines influence, while calm focus enhances it.

6. Practical Techniques
The book provides guidance on:

• Repetition of statements (affirmations)

• Focused attention and concentration

• Controlled speech and tone

• Visualization of desired outcomes

Tone and Style

The tone is practical, assertive, and instructional, reflecting the era’s fascination with personal magnetism and mental science. Leonard blends early psychological insight with a results-oriented mindset, focusing less on theory and more on application and control.

His work shares similarities with authors like William Walker Atkinson and Sidney Weltmer, particularly in its emphasis on suggestion and mental influence.

Overall Message

The Power to Control: Mental Suggestion teaches that influence—over oneself and others—is not accidental, but governed by principles that can be learned and applied.

By mastering thought, cultivating confidence, and using suggestion deliberately, individuals can gain greater control over behavior, interactions, and life direction.

In essence, Leonard’s message is:
Control your mind, and you begin to control your world.