It's So Simple Really: If You Say

Happiness And Freedom Begin With A Clear Understanding Of One Principle: Some Things Are Within Our Control, And Some Things Are Not. It Is Only After You Have Faced Up To This Fundamental Rule And Learned To Distinguish Between What You Can And Can't Control That Inner Tranquility And Outer Effectiveness Become Possible.

There Is But One Way To Tranquility Of Mind And Happiness, And That Is To Account No External Things Thine Own, But To Commit All To God.

It Has Been Ordained That There Be Summer And Winter, Abundance And Dearth, Virtue And Vice, And All Such Opposites For The Harmony Of The Whole, And (zeus) Has Given Each Of Us A Body, Property, And Companions.

Some Things Are Up To Us [eph' Hêmin] And Some Things Are Not Up To Us. Our Opinions Are Up To Us, And Our Impulses, Desires, Aversions–in Short, Whatever Is Our Own Doing. Our Bodies Are Not Up To Us, Nor Are Our Possessions, Our Reputations, Or Our Public Offices, Or, That Is, Whatever Is Not Our Own Doing.

Things True And Evident Must Of Necessity Be Recognized By Those Who Would Contradict Them.