
The three great essentials to achieve anything worthwhile are, first, hard word; second, stick-to-itiveness; third, common sense.
Thomas A. Edison
sept
10
2013

The three great essentials to achieve anything worthwhile are, first, hard word; second, stick-to-itiveness; third, common sense.
Thomas A. Edison
|
I never made one of my discoveries through the process of rational thinking Albert Einstein |
|
|
Brein meester Bij Bol.com | Managementboek |