What are spiritual things? When I speak the word spiritual, I'm talking about Godly, Holy Spirit, those things that are above. Satan and His kingdom are imitators of all things of God. So, when someone says spiritual things, this is a spiritual test of the spirit.  

Father May I? But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God. For what man knows the things of a man except the spirit of man which is in him.
Now we have received not the spirit of the world, but the Spirit who is from God that we might know the things that God has given us freely (1 Corinthians 2:10-12).
Our Spiritual things through the Holy Spirit are Praying in our Spiritual language, Praying in the Holy Spirit, Prayer, Reading and Meditating on God's Word, Worship, Praise, Fasting, and Spiritual Authority to step on the serpent's and scorpions' heads and not forsaking to assemble ourselves.

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Blessings upon blessings!