One of my theories is that men love with their eyes women love with their ears.

There are two theories on hitting the knuckleball. Unfortunately neither of them works.

Science is based on the possibility of objectivity on the possibility of different people checking out for themselves the observations made by others. Without that possibility there is no empirical principle capable of deciding between different arguments and theories.

How thoroughly it is ingrained in mathematical science that every real advance goes hand in hand with the invention of sharper tools and simpler methods which at the same time assist in understanding earlier theories and in casting aside some more complicated developments.

Sure science involves trial and error. Scientists refine theories each day. But as they do they help us grasp more clearly the wonders of the world and the universe.

Many writers upon the science of political economy have declared that it is the duty of a nation first to encourage the creation of wealth and second to direct and control its distribution. All such theories are delusive.

Today's preoccupation with physical theories of everything takes a wrong turn from the purpose of science - to question all things relentlessly. Modern physics has become like Swift's kingdom of Laputa flying absurdly on an island above the earth and indifferent to what is beneath.

The wise man regulates his conduct by the theories both of religion and science. But he regards these theories not as statements of ultimate fact but as art-forms.

I am an enthusiast but not a crank in the sense that I have some pet theories as to the proper construction of a flying machine. I wish to avail myself of all that is already known and then if possible add my mite to help on the future worker who will attain final success.

I have no useful theories about love and marriage.