It is very clear that no one can see or enter the Kingdom of God unless he or she has been "born again" (experienced the New Birth). So you can only discern the Kingdom of God after you are saved.
So the real issue is how does God bring about the New Birth? Jesus said "Except a man be born of WATER and of the SPIRIT he cannot enter the Kingdom of God" (John 3:5). And the Bible tells us that He uses (1) the Gospel and (2) the Holy Spirit to regenerate a sinner and make him a saint, with the Gospel as "the seed" of the New Birth and called "water" as a metaphor, and the Holy Spirit as the Divine Agent of the New Birth. The following Scriptures tell us exactly how this supernatural event occurs.
Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever. For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away: But the word of the Lord endureth for ever. And this is the word which by the gospel is preached unto you. (1 Peter 1:23-25)
But after that the kindness and love of God our Saviour toward man appeared, Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; Which he shed on us abundantly through Jesus Christ our Saviour; That being justified by his grace, we should be made heirs according to the hope of eternal life. (Titus 3:4-7)