Shared ground
Paul’s main point is that God’s “hidden” reality is not uncovered by ordinary human insight, but made known by God’s Spirit (spirit). The Spirit is described as uniquely able to know God’s “deep things,” in the way a person’s own inner self best knows that person’s thoughts (vv. 10–11).
The passage also links revelation to communication. What is revealed is then spoken: Paul says “we…speak” these things in words taught by the Holy Spirit rather than words shaped by human wisdom (v. 13). In context, this supports Paul’s larger contrast between status-driven “wisdom” and the message centered on Christ crucified (1:18–2:5).
Where interpretation differs (only where needed)
Who are “us/we”? Some read “us/we” mainly as Paul and other appointed messengers who first received and communicated the message. Others read “us/we” as including the wider believing community, since v. 12 speaks of having “received… the Spirit which is from God” so “we might know” God’s gifts.
What does “comparing spiritual things with spiritual things” mean? Some take it as matching spiritual truths with Spirit-taught words (Spirit-shaped content expressed in Spirit-shaped speech). Others take it as explaining spiritual realities to spiritual people, or interpreting spiritual realities by spiritual means (Scripture/Spirit-guided understanding), since the phrase is compact and can be rendered in more than one way.
Why the disagreement exists
The text uses “we/us” in a section where Paul sometimes speaks as an apostolic preacher (“we speak,” v. 13) and sometimes describes what believers have received (“we received… the Spirit,” v. 12). Also, the wording in v. 13 is brief and can naturally be read with different implied objects (words, people, or methods of explanation).
What this passage clearly contributes
Explicitly, it claims that God reveals “these things” through the Spirit; that only God’s Spirit knows God’s inner realities; that believers have received God’s Spirit rather than “the spirit of the world”; and that this reception aims at knowing what God has freely given (vv. 10–12). It also claims that Christian proclamation about these revealed things depends on Spirit-taught speech rather than the kind of “wisdom” prized in the surrounding culture (v. 13). Theological inferences that reasonably follow include that true knowledge of God’s saving purposes is a gift, and that the credibility of the message is grounded in divine disclosure more than social prestige or rhetorical performance (in line with the wider argument in 1 Corinthians 1:18–2:16).