One must shy away from questionable undertakings, even when they bear a high-sounding name.
Memory is deceptive because it is colored by today's events.
Understanding physics is child's play when compared to understanding child's play.
What counts can't always be counted; what can be counted doesn't always count.
A table, a chair, a bowl of fruit and a violin; what else does a man need to be happy.
No idea is conceived in our mind independent of our five senses [i.e., no idea is divinely inspired].