A stepping-stone can be a stumbling block if we can't see it until after we have tripped over it.

A stepping-stone can be a stumbling block if we can't see it until after we have tripped over it.

The past is a stepping stone, not a millstone.

Until we see a little more, I don't want to say there's concerns or a stumbling block.

Never be afraid to fail. Failure is only a stepping stone to improvement. Never be overconfident because that will block your improvement.

For a stone of stumbling and for a rock of offence.