katartizo is used for bringing something into a finished or ready condition, including mending, restoring, equipping, and training.

The dominant usage concerns bringing persons or things into a finished, ready, or suitably equipped condition: faith's deficiencies are addressed, believers are urged toward unity and readiness, and God is asked to equip them. In a more concrete cluster, it describes mending nets and restoring a person overtaken in trespass.

1. Bring to a ready or complete condition · dominant

   In 1 Thessalonians 3:10, the aorist active infinitive occurs with prayer to see the readers and address what the APB calls the “deficiencies of your faith.” In 1 Corinthians 1:10 and 2 Corinthians 13:11, perfect passive and present passive forms occur in appeals for a unified or completed condition; Hebrews 13:21 similarly asks that God “equip you with everything good.” Luke 6:40 uses a perfect passive participle for a disciple who, when fully trained, becomes like the teacher.

   1 Thessalonians 3:101 Corinthians 1:102 Corinthians 13:11Hebrews 13:21Luke 6:401 Peter 5:10
2. Mend or restore what is damaged · common

   In Matthew 4:21 and Mark 1:19, the present active participle describes James and John in a boat, where the APB renders the activity as “mending the nets.” In Galatians 6:1, the present active form addresses spiritual people responding gently to someone overtaken in trespass; the APB renders the clause “should restore such a person.”

   Matthew 4:21Mark 1:19Galatians 6:1

In the Anselm Project Bible: The APB varies its presentation among “complete,” “be completed,” “equip,” “fully trained,” “mending,” “restore,” and “prepared.” Because it translates whole verses rather than aligning English words to each Greek form, these renderings show the verse contexts rather than a fixed one-word equivalent.