Biblical meditation on Scripture is commanded (Joshua 1:8, Psalm 1:2). The concern is Eastern practices that empty the mind. Christian meditation fills the mind with God; Eastern empties it. 90/100 Spiritually Safe.
The Bible commands meditation — but on a specific object. Joshua 1:8: "meditate on it day and night." Psalm 1:2: "whose delight is in the law of the Lord, and who meditates on his law day and night." Philippians 4:8: "whatever is true, whatever is noble, whatever is right, whatever is pure... think about such things." Biblical meditation is filling the mind with specific truth — Scripture, God's character, his works, his promises. This practice is commanded as a spiritual discipline that produces wisdom, peace, and fruitfulness.
Eastern meditation practices aim at emptying the mind — achieving a state of consciousness without thought content, or merging individual consciousness with universal consciousness. This is fundamentally different from biblical meditation and raises real spiritual concerns. An empty mind is not spiritually neutral; Jesus warned about the return of evil when a house is swept clean but left empty (Matthew 12:43-45).
Mindfulness meditation as a purely clinical technique (focused attention without spiritual framework, used for anxiety management) is distinct from its Buddhist roots and is widely used in Christian contexts. The key question: what is the spiritual framework and objective? See our yoga guide for a related question.
For more on biblical meditation: Desiring God on Christian meditation.
Questions about sin fall into two categories: things explicitly called sin in Scripture, and disputable matters (Romans 14-15) where Christians with different convictions should respect each other's consciences. Even when something isn't explicitly sinful: Does this practice reflect Christ's lordship over all of life (Colossians 3:17)? Is it beneficial — not just permissible? (1 Corinthians 10:23). Score: 90/100 Christ-Centered.
See our Is It a Sin? hub. GotQuestions and the Gospel Coalition provide thorough evangelical analysis.