He must have some sure guide in a world of insane confusion.
When the will of another is involved, it's no sure guide at all.
The only sure guides are common sense, decency and restraint.
He followed the stream down, knowing it was a sure guide to the kind of animal life he wanted.
Those who say that reason is a surer guide will grow stronger.
Outward appearance, he decided, was no sure guide in such matters.
Of course, history is no sure guide, as the failure of the 55-day pattern proves.
County boundaries were no sure guide, though, especially as they had been changed in the seventies.
History may provide no sure guide to the future, but it does offer context and insight for the present.
The faint yellow light in the water was a sure guide.