We are baptized with the Holy Spirit and my experience of the Spirit involves daily thinking about God and living as Jesus commanded us to live.
I can watch a favorite TV show for a period of time but my mind drifts back to God and His command through Jesus to establish and grow his kingdom on earth as it is in heaven.
“Be serious”–?? I take this seriously and I am wounded only when I fail to realize God’s presence and to not do his will.
We all are called to holiness and to closeness with God, and even as creatures, to share in His nature. We have many daily cares and concerns, challenges too (to say the least), but we should orient our spiritual trajectory towards God, pleasing God, agreeing with God, etc.