Fear, doubt and skepticism belong to the ego. However, the conscious quality of discrimination is different. This is a virtue of the soul to not accept anything at face value, but to investigate in a scientific, hermetic and conscious way. As the Buddha Gautama stated long ago:

O monks and wise men, just as a goldsmith would test his gold by burning, cutting and rubbing it, so must you examine my words and accept them, not merely out of reverence for me.

Although we refer to "Doubting Thomas" in the Bible, he is really the reserved, selective and cultured judgment of a well-disciplined and educated soul, who only accepts Christ directly, not through filters or mediums. Such a consciousness experiments, and only accepts truth with absolute certainty derived from intimate, cognizant direct experience within meditation and internal planes.