Ok well I tend to agree that Jesus Christ is the truth. But I'm really not 100% sure. But let me talk first about what I think the truth is.
The truth is none of us really know what the next life brings.
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Not sure if this might be abit off topic maybe not being quite the main overall point of your OP, but re the quoted bit above we do have to have faith/believe but we don't just blindly believe or have faith without any evidences. Below is a list of some reasons why we can fairly surely believe the bible is true:
Prophecy: Fullfilled biblical prophecies, especially the ones about the messiah. Beasts and metal ages of Daniel. 7 church ages of Revelation.
Creation/Nature/Science/medical:
Bible says "heavens declare glory of the Lord" and people are "without excuse". (See Romans 1).
Also the fact that some things in the bible have been found to be remarkably scientifically correct (cleanliness laws, etc).
Evidences of design. Earth in just the right place for human life.
7 colours, 7 notes/tones, 7 nitrogenous bases, 3 lobes brain. Pregnancy/gestation periods multiples of 7.
Analogous body foods like tomatoes (look like heart), kidney beans (look like kidney), carrots (look like eye).
Materialism and the brain can't explain everything.
Evidences like the African Eve theory that we ultimately all came from one like Genesis says.
History/archaeology: There has been more and more evidences that biblical history is true at least as far back as Joseph.
The "myths" of many nations around the world confirm things like the worldwide flood, tower of Babel, etc.
Spiritual: There seems little doubt that sin/evil and the Devil and demons/evil spirits are true.
Miracles/signs/wonders/healings/coincidences:
Only Joseph could tell pharaohs dream.
Red Sea parting.
Only Daniel could tell Nebuchadnezzars dream.
Jesus performed many miracles including healing lepers, blind, deaf & dumb, raising the dead, feeding thousands.
Star of Bethlehem. Quake & eclipse at Crucifixion.
Answered prayers: many people have had answers to prayers.
Experiences:
Paul saw/heard Jesus.
Some people have had experiences like my friend Matthew said he saw Jesus face in the sky.
I had an experience where I was like One with God/Jesus or like spiritually touched him.
Some people have had out of body experiences, or died and came back to life.
People like Abraham and the prophets seem to have somehow heard God's words.
Some people have seen angels.
Judgements:
Flood. Tower of Babel. Sodom & Gomorrah. Exodus plagues. Exile/captivity. Destruction of Jerusalem 70 ad. Titanic.
Codes: The Bible Skip code.
Macro-codes: See fulfilled messianic prophecies. Many layers of bible verse. Many antetypes. Sign of Jonah.
This also includes mathematical signatures of God in the bible like many patterns of sevens in Genesis and Matthew.
Current events: The fact that Israel and the Jews and Jerusalem have been a major area/issue of contention in modern world history (eg Zionism, Nazis, PLO).
This also includes past plots to destroy the messianic line and people: Nimrod allegedly tried to kill Abraham? Pharaoh killed Hebrew babies (Exodus 1), Haman tried to kill Jews (Esther), Herod tried to kill Jesus (Matthew/Luke), Hitler allegedly directed a genocide/holocaust of Jews?
Prominent Jews like Joseph, Daniel, Mordechai, Jesus, Marx, Einstein, Sitchin, Velikovsky.
Prominent Christians like Isaac Newton, John Newton, Wilberforce.
The land of Israel/Palestine also has certain special historical & geograpical features.
The Hebrew language also has certain features which ....
Jesus: A number of scholars have pointed out that Jesus is one of the most famous/imfamous persons of world history.
No one has proven Jesus ever did any wrong/harm to anyone.
No body has been found anywhere (Jesus' tomb is empty).
(Wyatt also claims he found a sample of Jesus blood on top of the ark under Skull Hill / Gordon's Calvary which when lab tested showed a slightly different number of chromosomes to normal humans?
Some believe the Shroud of Turin is a genuine feature too, though it is doubtful.)
All the books of the bible written by many different authors over thousands of years have in common same/similar spirit.
Martyrdoms: That a number of the apostles and early christians suffered awful martyrdoms shows their faith must have been pretty great/strong for some reason(s).
Some of the things I have been suffering are unbelievable. I can't believe that there is no hope anywhere. There is no other hope/choice/option.
Evolution has too many missing links and reversals and shelved forbidden archaeological out of place artifacts and unreliable dating methods and too long lengths of gaps between events.
Many cultures of world history have believed in a God or gods
Neanderthals believed in the afterlife as evidenced by their funeraru/burial rites/practices.
"Eternity in their hearts".
Can't help believing God/bible is true.
"It fits".
Article on primitive religion says a certain amount of ideas of what is good/right and evil/wrong are common to many cultures throughout history.
Counterfeit/corrupt analogies: All religions, myths, political philosophies etc have analogies/copies of the Biblical faith. "Devil is the ape of God". Even Nazism had a spritiual/occult/mystical/magical aspect as shown in the book Messianic Legacy. China had a "worship of heaven" religion before Taoism & Confucianism.
Comparing some of the analogies:
The bible is more remarkable scriptures of Jewish & Christian religion than some other scriptures/books of other religions such as the Koran/Quran of Islam.
Jesus is more remarkable than Mohammed or King Arthur or Hitler etc.
Wisdom/truths/laws: The wisdom of people like Joseph, Solomon, Jesus, messianic Jews.
Conscience/guilt/fear.
Somewhere deep down people seem to know though they live in denial. Revelation 6? says they will say "the great day of the lord and his wrath has come", which seems to imply they knew.
Human life is too short, there must be more.
2 or 3 witnesses.
No one has proven the bible is not true.
Peoples testimonies & changed lives.
For the rest of the OP and the overall point as far as I could guessingly understand it from the not entirely clear/definite wording yes we are all short of and seeking/striving for the whole of the truth which only God (Yhwh/Jhvh) / Yeshua/Jesus fully knows/sees/is.
However I don't like the liking of "negative" habitual thinking/feeling in modern Christianity & even Messianism. Sure we are sinners and humbly seek the Truth, but the liking such self punishment/guilt and tough/harsh/hard way seems unhealthy and doesn't appeal to me. People often have claimed I am "negative" yet I see how Christians and even non-Christians are so liking of this tough and self punishment/guilt/suffering/misery or "slave morality" or poverty gospel.
Yhwh/Jhvh bless us and keep us.