And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke.
This must be what you are speaking of Searching for truth ?
Joel 2 is the Prophecy that Jesus Christ fulfills by the Spirit of prophecy being the SPIRIT of TRUTH
Its the coming of the Lord Jesus Christ and we know He did come to Judge the world in righteousness
and many of the prophecies of Joel 2 have been fulfilled
such as the Day of Pentecost in Acts 1 when the promise of the Holy Spirit would be poured out on all flesh
For all of us its how we "perceive " become aware or conscious of the Word of God come to realize or understand the scriptures .
And interpret or look on the Word of God in a particular way or regard as truth .
Some still with fear and carnal understanding
and Some by the Very Spirit of truth that God increases with the Knowledge of Him though Jesus Christ
We ask for His truth and wisdom in life and less and less of our own truth and understanding and wisdom
He must increase and the Light must shine within us
I do not believe we can convince anyone but we are to persuade them in the right direction with prayers that God will help them , just as he did you to understand what the Spirit is saying as Truth