We should not say that one man's hour is worth another man's hour, but rather that one man during an hour is worth just as much as another man during an hour. Time is everything, man is nothing: he is at the most time's carcass. Karl Marx on time
The ideas of the ruling class are in every epoch the ruling ideas, i.e., the class which is the ruling material force of society, is at the same time its ruling intellectual force. Karl Marx on time
Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science. Karl Marx on time
From each according to his abilities, to each according to his needs. Karl Marx on ability
All social rules and all relations between individuals are eroded by a cash economy, avarice drags Pluto himself out of the bowels of the earth. Karl Marx on avarice
The philosophers have only interpreted the world; the thing, however, is to change it. Karl Marx on philosophy