'Trust' indicates a depth and a sense of assurance that is based on strong but not logically-conclusive evidence, or based on the character, ability, or truth that someone or something has shown over time or across situations. Trust makes for a sense of being safe or of being free of fear, enough so that one's focus can be on other matters because that matter is taken care of. It becomes easier to simply enjoy life.

No human is totally trustworthy.
No human is totally untrustworthy.
No human can always trust themselves.
No human is totally trusting of any one other person.

Trust is a risk. We leave ourselves open for loss. Betrayal of trust hurts so much because the lost sense of security multiplies the damage.