It's impossible to receive the Holy Spirit without hearing the gospel, Les told a great anecdote about a lady who has gone to church all her life and went through all the rituals, customs and traditions... it wasn't until she joined his class to study the word that her heart was opened and she received the Spirit according to her.
He explains what Paul means by the busy body and foolishness of men who hang on to traditions but without earnest understanding of the gospel they hardly know what they even believe, very true, its our belief/faith that saves through grace and without true understanding of the gospel how can you mature? You remain a babe much like the early pagan converts in his days.. Philosophy vs Signs, Greek vs Jew, Paul refutes both by saying neither vanities will do any good.
For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect. For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God. For it is written, I will destroy the wisdom of the wise, and will bring to nothing the understanding of the prudent. Where is the wise? where is the scribe? where is the disputer of this world? hath not God made foolish the wisdom of this world? For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe. For the Jews require a sign, and the Greeks seek after wisdom: But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness; But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God. Because the foolishness of God is wiser than men; and the weakness of God is stronger than men. For ye see your calling, brethren, how that not many wise men after the flesh, not many mighty, not many noble, are called: But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty; And base things of the world, and things which are despised, hath God chosen, yea, and things which are not, to bring to nought things that are: That no flesh should glory in his presence. But of him are ye in Christ Jesus, who of God is made unto us wisdom, and righteousness, and sanctification, and redemption: That, according as it is written, He that glorieth, let him glory in the Lord.
1 Corinthians 1:17-31