What it means to be spiritual?

The Bible says, at Matthew 5:3 " Happy are those conscious of their spiritual needs."

1Corinthians 2:16 ask, "Who has come to know the mind of Jehovah (God), so that he may instruct us?" But adds, "We do have the mind of Christ."

Ultimate answer: John 17:3 says taking in knowledge of God and His son Jesus is the key to getting to know what is considered spiritual from God's standpoint.

Go to (jw.org) for further information.