We owe a lot to the Indians, who taught us how to count, without which no worthwhile scientific discovery could have been made.
Albert EinsteinHowever we select from nature a complex [of phenomena] using the criterion of simplicity, in no case will its theoretical treatment turn out to be forever appropriate (sufficient).... I do not doubt that the day will come when [general relativity], too, will have to yield to another one, for reasons which at present we do not yet surmise. I believe that this process of deepening theory has no limits.
Albert Einstein