It is essential to know the truth, to have our lives founded on the truth and to walk in the truth.
So much falsehood and false sayings have crept into Christianity that many professing Christians have lost their ability to even recognize the truth when they hear it.
False doctrines and false creeds are everything and have crept into every religious sect and denomination.
Brethren, in order to worship the Father we must worship Him in truth.
Jesus said, But the hour is coming and now is here, when the true worshippers will worship the Father in spirit and in truth. For the Father also seeks such to worship Him. God is Spirit, and they who worship Him must worship in spirit and in truth. (John 4:23,24)
Abel's offering was accepted because his offering was offered in truth.
Cain did not offer up the first fruits of his life and attempted to lie to God.
Walk in truth.