"Faith is believing" suggests that faith is an act of belief, a conscious choice to accept something as true or real even in the absence of tangible evidence. It's a matter of trust and conviction.
The phrase "in what you cannot see" emphasizes that faith often relates to matters beyond the physical realm. It can pertain to spiritual beliefs, trust in others, or confidence in the unseen forces of the universe.
In essence, this quote highlights the fundamental nature of faith: the ability to hold steadfast beliefs and trust in the intangible, the unseen, and the unproven. It acknowledges that faith plays a significant role in various aspects of life, from religious and spiritual convictions to having faith in oneself and others.