When Morpheus is captured by the Agents, Trinity and her colleagues try to figure out how to get him back. Neo believes he and Trinity can rescue Morpheus from the Matrix. Trinity doesn't believe this is possible.
TRINITY: No one has ever done anything like this.Trinity's decision is based on the known. The problem with what is known is that it limits you to what you believe is possible. In other words, your expectations keep you trapped in a box of your own creation. Trinity's previous encounter with the Agents has created a box she can't see a way out of. She believes that with two against so many Agents, they are bound to get themselves killed.
NEO: Yeah? That's why it's going to work. The Matrix
Neo, on the other hand, is basing his decision on that which is unknown.
But that is impossible! How can you achieve something when you don't have the necessary experience?
What is usually considered "impossible" is that which you can't figure out. Neo knows that when you haven't experienced something before, you have no preconceived ideas about how things should pan out. In other words, you are quite fluid and anything is possible. All you have to do is believe in yourself.
Neo's self-belief pays off and they rescue Morpheus from the Matrix.
As I see it, it is much easier to believe in that which is unknown than that which is known because in the unknown all things are possible.
Related articles: Highly Illogical, Captain!; Believing in the Impossible; The Power of Identification; The Importance of Self-Belief; Self-Realisation; Stepping Outside the Box; Me and My Fancy Education!; The Hard Facts; Unknown Territory, Causeless Cause; Walking by Faith and Not by Sight