Faith allows us to let go of our ego-self so we can see the Truth of every fear we harbor, regardless of how subtle it may be.Luke 9:23 "And he said to them all, If any man will come after me, let him deny himself, and take up his cross daily, and follow me.
9:24 For whosoever will save his life shall lose it: but whosoever will lose his life for my sake, the same shall save it.
Our ego fears the truth, especially of itself, because it is an invalid (not real) story fabricated by the mind to make sense of itself (identity). That is why the ego always seeks validation, and will even murder, or commit suicide to avoid DEATH, as irrational as that may seem. This avoidance of losing self-esteem (ego-energy) is its prime defensive mission. Our ego-mind will create all sorts of suggestions, and past untrue beliefs, to steer our thinking towards self-validation. Our cross is to deny our ego-self by putting our faith in God that we will still be okay if we remain humble, soft, and gentle; to becalm the ego so Truth can take center stage of our life.
What this means, and how it is related to the cross, is not only denying ourselves, but to do this requires us to be exposed and vulnerable to ALL the fears our ego will raise in us to avoid the Truth, and get our mind back to seeking validation again. What I mean by fears includes anger, impatience, intolerance, and anything else that makes us restless, irritable, and discontent. Only faith in God can becalm our ego.
However, the ego (mind) is very cunning and very subtle too. It's main trick, while becalmed, is to "claim" anything, including Truth, to its resume of validity. "I know....". When this happens we slip so subtly from heart to head, and the Holy Spirit no longer quenches our heart with living water.