Morris Kline Quote

The conquest of new domains of mathematics proceeds somewhat as do military conquests. Bold dashes into enemy territory capture strongholds. These incursions must then be followed up and supported by broader, more thorough and more cautious operations to secure what has been only tentatively and insecurely grasped.

Mathematical Thought from Ancient to Modern Times, Chapter 19 (p. 400), Oxford University Press, Inc. 1972