'Sure' in the Bible

He had also, after He suffered, shown Himself alive to them with many sure proofs, appearing to them at intervals during forty days, and speaking of the Kingdom of God.

What then ought you to do? They are sure to hear that you have come to Jerusalem;

And a light breeze from the south sprang up, so that they supposed they were now sure of their purpose. So weighing anchor they ran along the coast of Crete, hugging the shore.