en_tn/col/01/26.md

This is the secret truth that was hidden

This can be stated in active form. Alternate translation: "This is the secret truth that God had hidden" (See: rc://en/ta/man/translate/figs-activepassive)

for ages and for generations

The words "ages" and "generations" refer to the time period from the creation of the world until the time when the gospel was preached.

now it has been revealed

This can be stated in active form. Alternate translation: "now God has revealed it" (See: rc://en/ta/man/translate/figs-activepassive)