You have no idea who is in heaven

Lutero
You have no idea who is in heaven either, but that doesn't stop you praying to them. How very odd.

Yes we do. The Church recognizes individuals who lived such holy lives that they set examples for others to follow:
Hebrews 6:12

King James Version (KJV)
¹² That ye be not slothful, but followers of them who through faith and patience inherit the promises.