Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you.
The thought manifests as the word. The word manifests as the deed. The deed develops into habit. And the habit hardens into character. So watch the thought and its ways with care. And let it spring from love, born out of concern for all beings.
Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.