Today's practicality is often no more than the accepted form of yesterday's theory.
Sentiment: NEGATIVE
A theory must be tempered with reality.
The standard theory may survive as a part of the ultimate theory, or it may turn out to be fundamentally wrong. In either case, it will have been an important way-station, and the next theory will have to be better.
In theory there is no difference between theory and practice. In practice there is.
Today is the only day. Yesterday is gone.
The implications of these considerations justify the statement that all empirically verifiable knowledge even the commonsense knowledge of everyday life - involves implicitly, if not explicitly, systematic theory in this sense.
No theory changes what it is a theory about; man remains what he has always been.
The science of today is the technology of tomorrow.
Life is so unlike theory.
Today is reality. Yesterday is history.
The modernity of yesterday is the tradition of today, and the modernity of today will be tradition tomorrow.