I'd call that the most valuable thing he gave us.
"We have heard of valuable things far away down the river," they said.
I'd never actually seen one, so it would be a valuable thing to do in any case.
And I think it's a very valuable thing to do.
They are good and valuable things to have, but you must keep the matter a secret.
There are a great number of small, valuable things in this house.
"Your family is the most valuable thing you have," she said.
"Sleep is the most valuable thing I can get my hands on," she said.
I still think his poetry is one of the most valuable things we have.
"We have more valuable things to do with our time."