“Women have ever been the stumbling block and betrayers of ambition.”

“A stumbling block to the pessimist is a stepping-stone to the optimist.”

“The only real stumbling block is fear of failure. In cooking you've got to have a what-the-hell attitude.”

“For there to be betrayal, there would have to have been trust first.”

“Betrayal. That’s the first thing I feel, which is ludicrous. For there to be betrayal, there would have had to been trust first.”

“The art of growing old is the art of being regarded by the oncoming generations as a support and not as a stumbling-block, as a confidant and not as a rival.”

“Could technology, understood as the disposition and activity of mastery, turn out to be a stumbling block in the path of the master himself?”

“There will always be rocks in the road ahead of us. They will be stumbling blocks or stepping stones; it all depends on how you use them.”

“Instead of looking on discussion as a stumbling block in the way of action, we think it an indispensable preliminary to any wise action at all.”

“In point of fact, Western philosophy has never set itself free of Christianity: wherever Christianity did not have a hand in the construction of modern philosophy it served instead as a stumbling block.”