From Webster's 1828 Dictionary, which I love to use as a bible study tool, there is moral truth...
3. Conformity of words to thoughts, which is called moral truth.
I always counsel singles and friends to pay attention to someone's actions in relation to their words. IF they do not match then there's a problem. Jesus said the Truth and then acted out Truth. His words and actions always matched.
To do truth, is to practice what God commands. John 3.
I like this definition of Truth also:
4. Veracity; purity from falsehood; practice of speaking truth; habitual disposition to speak truth; as when we say, a man is a man of truth.
...and veracity:
VERAC'ITY, n. [L. verax, from verus, true.]
1. Habitual observance of truth, or habitual truth...
"The veracity of facts." is not correct language. Truth is applicable to men and to facts; veracity to men only, or to sentient beings.
2. Invariable expression of truth; as the veracity of our senses.
...and on purity
PU'RITY, n. [L. puritas, form purus.]
1. Freedom from foreign admixture or heterogeneous matter; as the purity of water, of wine, of spirit; the purity of drugs; the purity of metals.
2. Cleanness; freedom from foulness or dirt; as the purity of a garment.
The purity of a linen vesture.
3. Freedom from guilt or the defilement of sin; innocence; as purity of heart or life.
4. Chastity; freedom from contamination by illicit sexual connection.
5. Freedom from any sinister or improper views; as the purity of motives or designs.
6. Freedom from foreign idioms, from barbarous or improper words or phrases; as purity of style or language.
So, I think it is safe to conclude that if there is any impurity in our statements and no veracity of our character/actions what we say and/or do may not be Truthful. ...just an example, to exaggerate is to lie.
Truth is not a thing but a person. Christ is the truth. There is no concept of truth apart from Jesus Christ. Jesus said: "I am the way, the truth and the life. No one comes to the Father except through Me" (John 14:6). Many other religions seek a truth separate from Christ. the Gnostics seek truth through accumulation of secret knowledge. The same is true of most occult religions. Islam seweks truth from many sources including Christ and Mohammad but the don't recognize Christ as the Son of God. Buddhism seeks truth through inner knowledge by meditation. Other religions have their own truth.
There is only one way to truth-through the person of Jesus Christ. Christ said that anyone who comes up some other way except through Him is a thief and a robber(John 10:1-5). Christ rejected many who did not do His will by telling them "I do not know you". If we come to know Christ in a personal relationship we know truth.
