And ye shall know the truth (kai gnwsesqe thn alhqeian). Truth is one of the marks of Christ (Jo 1:14) and Jesus will claim to Thomas to be the personification of truth (Jo 14:6). But it will be for them knowledge to be learned by doing God's will (Jo 7:17). The word is from alhqh (a privative and lhqw, to conceal, unsealed, open). See also verses Jo 40 44 45. And the truth shall make you free (kai h alhqeia eleuqerwsei uma). Future active indicative of eleuqerow, old verb from eleuqero (from ercomai, to go where one wishes and so free). One of Paul's great words for freedom from the bondage of the law ( Romans 6:18 ; Galatians 5:1 ). The freedom of which Jesus here speaks is freedom from the slavery of sin as Paul in Romans 8:2 . See John 8:36 . This freedom is won alone by Christ ( John 8:36 ) and we are sanctified in truth ( John 17:19 ). In John 1:17 truth is mentioned with grace as one of the marks of the gospel through Christ. Freedom (intellectual, moral, spiritual) is only attainable when we are set free from darkness, sin, ignorance, superstition and let the Light of the World shine on us and in us.