John 1:48

Whence knowest thou me?

Nathanael, who had never met Jesus before, was surprised to hear himself spoken of as one known.

When thou wast under the fig tree.

There was Something about this answer that filled Nathanael with astonishment. Under the shade and shelter of the fig tree he had had some rare experience that is not recorded, and that he supposed unknown to man. That Jesus knew of it and read his soul startled him and dissipated his unbelief.