What do the Great Minds of history have to say that is relevant to Positive Thinking and the Law of Attraction? Read on:

Ask for what is great and what is small shall be given to you as well.
– Clement of Alexandria

Magic is believing in yourself, if you can do that, you can make anything happen.
– Johann Wolfgang von Goethe

Understanding is the reward of faith. Therefore, seek not to understand that thou mayest believe, but believe that thou mayest understand.
– Augustine of Hippo, Tractates on the Gospel of John, Tractate 29

Cheerfulness I Have observed, that in comedies the best actor plays the droll, while some scrub rogue is made the fine gentleman or hero. Thus it is in the farce of Life, wise men spend their time in Mirth, ‘tis only fools who are serious.
– Lord Bolingbroke

True Joy is a serene and sober motion : and they are miserably out, that take Laughing for rejoicing : the seat of it is within, and there is no Cheerfulness like the resolutions of a brave mind.
— Seneca

Enthusiasm is always connected with the Senses, whatever be the object that excites it. The true strength of Virtue is serenity of mind, combined with a deliberate and steadfast Determination to execute her laws. That is the healthful condition of the Moral Life ; on the other hand, Enthusiasm, even when excited by representations of goodness, is a brilliant but feverish glow, which leaves only exhaustion and languor behind.
– Kant

The heaven that rolls around cries aloud to you while it displays its eternal beauties, and yet your eyes are fixed upon the earth alone.
– Dante

The gem cannot be polished without friction, nor man perfected without trials.
– Chinese Proverb

Wholeness … is indispensable to Faith. What we believe, we must believe wholly and without reserve ; wherefore the only perfect and satisfying object of Faith is God. A Faith that sets bounds to itself, that will believe so much and no more, that will trust thus far and no farther, is none.
-Anon.

Intrepidity is an extraordinary strength of Mind, which raises it above the troubles, the disorders, and the emotions, which the sight of great perils is calculated to excite ; it is by this strength that Heroes maintain themselves in a tranquil state of Mind, and preserve the free use of their Reason under the most surprising and terrible circumstances.
-La Rochefoucauld

As the Soil, however rich it may be, cannot be productive without Culture, so the Mind without Cultivation can never produce good Fruit.
— Seneca.

Small letters hurt the sight, so do small matters him that is too much intent upon them : they vex and stir up Anger, which begets an evil habit in him in reference to greater Affairs.
— Plutarch

‘THERE is a Tide in the affairs of men,
Which, taken at the flood, leads on to Fortune;
Omitted, all the voyage of their
Life Is bound in shallows, and in miseries
And we must take the Current when it serves,
Or lose our ventures.
— Shakespeare

‘Try to be happy in this very present Moment ; and put not off being so to a Time to come : as though that Time should be of another make from this, which is already come, and is ours.
—— Fuller

He who has given satisfaction to the best of his time has lived for ages.
– Schiller

It is interesting to notice how some minds seem almost to create themselves, springing up under every disadvantage, and working their solitary but irresistible way through a thousand obstacles.
– Washington Irving

All misfortune is but a stepping stone to fortune.
– Henry David Thoreau

Let the wise man guard his thoughts, for they are difficult to perceive, very artful, and they rush wherever they list: thoughts well guarded bring happiness. Those who bridle their mind which travels far, moves about alone, is without a body, and hides in the chamber (of the heart), will be free from the bonds of Mara (the tempter). If a man’s thoughts are unsteady, if he does not know the true law, if his peace of mind is troubled, his knowledge will never be perfect.
– from The Dhammapada

If one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with success unexpected in common hours.”
– Henry David Thoreau

The world of tomorrow belongs to the person who has the vision today.
– Robert Schuller

All the dignity of man consists in thought. Thought is therefore by its nature a wonderful and incomparable thing. … Thought constitutes the greatness of man. Man is but a reed, the most feeble thing in nature; but he is a thinking reed.
– Pascal

Go confidently in the direction of your dreams. Live the life you have imagined.
– Henry David Thoreau

Every great dream begins with a dreamer. Always remember, you have within you the strength, the patience, and the passion to reach for the stars to change the world.
– Harriet Tubman

So far as man stands for anything, and is productive or originative at all, his entire vital function may be said to have to deal with maybes. Not a victory is gained, not a deed of faithfulness or courage is done, except upon a maybe; not a service, not a sally of generosity, not a scientific exploration or experiment or text-book, that may not be a mistake. It is only by risking our persons from one hour to another that we live at all. And often enough our faith beforehand in an uncertified result is the only thing that makes the result come true.
– William James

The fate which oppresses us is the sluggishness of our spirit. By enlargement and cultivation of our activity, we change ourselves into fate.
– Novalis

The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it.
– Michelangelo

Vision is the art of seeing the invisible.
– Jonathan Swift

Belief consists in accepting the affirmations of the soul; unbelief, in denying them.
– Ralph Waldo Emerson

It is always easier to believe than to deny. Our minds are naturally affirmative.
– John Burroughs

First say to yourself what you would be; and then do what you have to do.
– Epictetus

Destiny is not a matter of chance, but of choice. Not something to wish for, but to attain.
– William Jennings Bryan

Every man is the architect of his own fortune.
– Sallust

Fortune favors the bold.
-Cicero

“The soul attracts that which it secretly harbours; that which it loves, and also that which it fears. It reaches the height of its cherished aspirations. It falls to the level of its unchastened desires – and circumstances are the means by which the soul receives its own.
– James Allen

Nature imitates herself. A seed sown in good ground brings forth fruit. A principle, instilled into a good mind, brings forth fruit.
– Pascal