from C.G. Jacobi's Lecture

[ From C.G. Jacobi's lecture on being admitted to the Faculty of the University of Königsberg, July 7, 1832 ]
.....
Crescunt disciplinae lente tardeque, per varios errores sero perventiur ad veritatem, omnia praeparata esse debent diurno et assiduo labore ad introitum veritatis novae; jam illa, certo temporis momento, divina quadam necessitate coacta emergit .....
(quoted from Math. Ann. 56(1903)252)

(Science grows slowly and gently; reaching the truth by a variety of errors. One must prepare the introduction of a new idea through long and diligent labour; then, at a given moment, it emerges as if compelled by a divine necessity .....)