If All Mankind Were Suddenly To Practice

There Is No More Important Rule Of Conduct In The World Than This: Attach Yourself As Much As You Can To People Who Are Abler Than You And Yet Not So Very Different That You Cannot Understand Them.

A Good Method Of Discovery Is To Imagine Certain Members Of A System Removed And Then See How What Is Left Would Behave: For Example, Where Would We Be If Iron Were Absent From The World: This Is An Old Example.

If Another Messiah Was Born He Could Hardly Do So Much Good As The Printing-press.

If There Were Only Turnips And Potatoes In The World, Someone Would Complain That Plants Grow The Wrong Way.

If You Are Going To Build Something In The Air It Is Always Better To Build Castles Than Houses Of Cards.