If a radio doesn’t have an antenna, good luck getting music out of it.
This is part of it too. God is with every soul, and the guide is with every soul. Satan's minions and the Guide from God tug war between every soul. It's about listening to who and what, and from where we are tuning our "antenna's
I think that some are not ready for God to just pop inside their head with a voice, and start giving them instructions.
In my view, we have to see the proof of God's light unseen type signs with love, if we don't, it harms us. Since love is through free-will, this vision has to be striven for. Once, we see God's light, it can be as expressed in the following prayer taught by Imam Ali (a):
إِلٰهِي هَبْ لي كَمَالَ ٱلاِنْقِطَاعِ إِلَيْكَ
ilahi hab li kamala alinqita`i ilayka
My Lord, (please) grant me absolute devotion to You
وَأَنِرْ أَبْصَارَ قُلُوبِنَا بِضِيَاءِ نَظَرِهَا إِلَيْكَ
wa anir absara qulubina bidiya'i nazariha ilayka
and illumine the vision of our hearts by the light of their gaze looking towards You
حَتَّىٰ تَخْرِقَ أَبْصَارُ ٱلْقُلُوبِ حُجُبَ ٱلنُّورِ
hatta takhriqa absaru alqulubi hujuba alnnuri
until the vision of our hearts pierces the curtains of light
فَتَصِلَ إِلَىٰ مَعْدِنِ ٱلْعَظَمَةِ
fatasila ila ma`dini al`azamati
to reach the source of greatness,
وَتَصِيرَ أَرْوَاحُنَا مُعَلَّقَةً بِعِزِّ قُدْسِكَ
wa tasira arwahuna mu`allaqatan bi`izzi qudsika
and that our souls become suspended by the majesty of Your Holiness.
إِلٰهِي وَٱجْعَلْنِي مِمَّنْ نَادَيْتَهُ فَأَجَابَكَ
ilahi waj`alni mimman nadaytahu fa-ajabaka
My Lord, (please) appoint me of those who responded to You when You called them,
وَلاحَظْتَهُ فَصَعِقَ لِجَلالِكَ
wa lahaztahu fasa`iqa lijalalika
and at whom You glanced so he swoons before Your Majesty
فَنَاجَيْتَهُ سِرّاً وَعَمِلَ لَكَ جَهْراً
fanajaytahu sirran wa `amila laka jahran
So You speak to him secretly and he works for You openly.