"The 7 Habits of Highly Effective People" by Stephen R. Covey

Kindle Edition here.

• "If we wanted to change the situation, we first had to change ourselves. . . And to change ourselves effectively, we first had to change our perceptions."

• "Each of us guards a gate of change that can only be opened from the inside."

• "what we are communicates far more eloquently than anything we say or do"

• "until a person can say deeply and honestly, “I am what I am today because of the choices I made yesterday,” that person cannot say, “I choose otherwise.”

• "The way we see the problem is the problem."

• "We are what we repeatedly do. Excellence, then, is not an act, but a habit."

"The Power of Concentration" by Theron Q. Dumont

Free Kindle edition here.

• "Concentration makes the will and intellect act in unison."

• "Most people are imitators and copiers of their past selves."

• "It is just as easy to be courageous as cowardly. Courage concentrates the mental forces on the task at hand."

• "No one knows what they can do until they try."

"The Way of Peace" by James Allen

Kindle edition here.

• "Meditation is the intense dwelling, in thought, upon an idea or theme, with the object of thoroughly comprehending it, and whatsoever you constantly meditate upon you will not only come to understand, but will grow more and more into its likeness, for it will become incorporated into your very being, will become, in fact, your very self. If, therefore, you constantly dwell upon that which is selfish and debasing, you will ultimately become selfish and debased; if you ceaselessly think upon that which is pure and unselfish you will surely become pure and unselfish."
• "There is an unavoidable tendency to become literally the embodiment of that quality upon which one most constantly thinks."
• "He who would secure any worldly advantage must be willing to work vigorously for it, and he would be foolish indeed who, waiting with folded hands, expected it to come to him for the mere asking."
• "Do not then vainly imagine that you can obtain the heavenly possessions without making an effort."

"As a Man Thinketh" by James Allen

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• "The aphorism, "As a man thinketh in his heart so is he," not only embraces the whole of a man's being, but is so comprehensive as to reach out to every condition and circumstance of his life. A man is literally what he thinks, his character being the complete sum of all his thoughts."
• "Act is the blossom of thought, and joy and suffering are its fruits"
• "cause and effect is as absolute and undeviating in the hidden realm of thought as in the world of visible and material things"
• "A noble and Godlike character is not a thing of favour or chance, but is the natural result of continued effort in right thinking, the effect of long-cherished association with Godlike thoughts. An ignoble and bestial character, by the same process, is the result of the continued harbouring of grovelling thoughts."
• "Man is made or unmade by himself; in the armoury of thought he forges the weapons by which he destroys himself; he also fashions the tools with which he builds for himself heavenly mansions of joy and strength and peace."
• "man is the master of thought, the moulder of character, and the maker and shaper of condition, environment, and destiny"