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I am really cautious about what I say and do.

I guess you could say I'm pretty wary.

I always try to be cautiously optimistic.

How prone to doubt, how cautious are the wise!

The cautious seldom err.

The policy of being too cautious is the greatest risk of all.

I'm instinctively cautious because I'm an academic.

I am sufficiently wary of dangerous situations, but I'm not scared of having a go.

I'm very wary of trust, you see.

Well, I need to be frightened on a regular basis.