"The treasure gained by the householder he does not hoard. He brings it forth to communicate to others. And by use the treasure increases. The householder has precious things both new and old. So Christ teaches that the truth committed to His disciples is to be communicated to the world. And as the knowledge of truth is imparted, it will increase. COL 124.2"
"What I tell you in darkness, that speak ye in light: and what ye hear in the ear, that preach ye upon the housetops."
Both passages connect the sharing of truth with its increase and propagation. EGW emphasizes the householder sharing treasure and its subsequent increase, mirroring the idea in Matthew 10:27 of speaking what is heard in secret openly.