To Me The Meanest Flower That Blows Can Give Thoughts That Do Often Lie Too Deep For Tears.
~ William Wordsworth, "Ode: Intimations of Immortality from Recollections of Early Childhood", 1803

As Surgeons Keep Their Instruments And Knives Always At Hand For Cases Requiring Immediate Treatment, So Shouldst Thou Have Thy Thoughts Ready To Understand Things Divine And Human, Remembering In Thy Every Act, Even The Smallest, How Close Is The Bond That Unites The Two.
~ Marcus Aurelius Antoninus

All Our Thoughts And Concepts Are Called Up By Sense-experiences And Have A Meaning Only In Reference To These Sense-experiences. On The Other Hand, However, They Are Products Of The Spontaneous Activity Of Our Minds They Are Thus In No Wise Logical Consequences Of The Contents Of These Sense-experiences. If, Therefore, We Wish To Grasp The Essence Of A Complex Of Abstract Notions We Must For The One Part Investigate The Mutual Relationships Between The Concepts And The Assertions Made About Them For The Other, We Must Investigate How They Are Related To The Experiences.
~ Albert Einstein

All Truly Wise Thoughts Have Been Thoughts Already Thousands Of Times; But To Make Them Truly Ours, We Must Think Them Over Again Honestly, Till They Take Root In Our Personal Experience.
~ Johann Wolfgang von Goethe

Those Who Cannot Tell What They Desire Or Expect, Still Sigh And Struggle With Indefinite Thoughts And Vast Wishes.
~ Ralph Waldo Emerson

To Know Someone Here Or There With Whom You Can Feel There Is Understanding In Spite Of Distances Or Thoughts Expressed.
~ Johann von Goethe

Second Thoughts Are Ever Wiser.
~ Euripides

I Am Absolutely Convinced That No Wealth In The World Can Help Humanity Forward, Even In The Hands Of The Most Devoted Worker. The Example Of Great And Pure Individuals Is The Only Thing That Can Lead Us To Noble Thoughts And Deeds. Money Only Appeals To Selfishness And Irresistibly Invites Abuse. Can Anyone Imagine Moses, Jesus Or Ghandi Armed With The Money-bags Of Carnegie.
~ Albert Einstein

The Problem Is Never How To Get New, Innovative Thoughts Into Your Mind, But How To Get Old Ones Out. Every Mind Is A Building Filled With Archaic Furniture. Clean Out A Corner Of Your Mind And Creativity Will Instantly Fill It.
~ Dee Hock

Words Ought To Be A Little Wild, For They Are The Assault Of Thoughts On The Unthinking.
~ John M. Keynes

Work Joyfully And Peacefully, Knowing That Right Thoughts And Right Efforts Inevitably Bring About Right Results.
~ James Allen

I Still Find Each Day Too Short For All The Thoughts I Want To Think, All The Walks I Want To Take, All The Books I Want To Read, And All The Friends I Want To See.
~ John Burrough