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. Mark ix. 24." --
"With the heart man believeth unto righteousness. Rom. x. 10." --
2. To think; to suppose.
"I will not believe so meanly of you. Fielding." --
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." J. H. Newman. (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." John xiv. 1. (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.
To believe on
to accept implicitly as an object of religious trust or obedience; to have faith in.