12 We do not want you to become lazy, but to imitate those who through faith and patience inherit what has been promised.

Read Hebrews 6:12 Using Other Translations

That ye be not slothful, but followers of them who through faith and patience inherit the promises.
so that you may not be sluggish, but imitators of those who through faith and patience inherit the promises.
Then you will not become spiritually dull and indifferent. Instead, you will follow the example of those who are going to inherit God’s promises because of their faith and endurance.