1.To have a firm persuasion, esp. of the truths of religion; to have a persuasion approaching to certainty; to exercise belief or faith. "Lord, I believe; help thou mine unbelief." "With the heart man believeth unto righteousness."
2.To think; to suppose. "I will not believe so meanly of you."
To believe in. (a)To believe that the subject of the thought (if a person or thing) exists, or (if an event) that it has occurred, or will occur; as, to believe in the resurrection of the dead. "She does not believe in Jupiter."
(b)To believe that the character, abilities, and purposes of a person are worthy of entire confidence; especially that his promises are wholly trustworthy. "Let not your heart be troubled: ye believe in God, believe also in me."
(c)To believe that the qualities or effects of an action or state are beneficial: as, to believe in sea bathing, or in abstinence from alcoholic beverages.