John Richardson of GenerousChurch provides some helpful insight into the question: In light of Jesus' words in Matthew 6:2-4, should my giving stay behind shut doors?
We know from our Sunday study of II Corinthians 8-9 that generosity can't be as simple as all-secrecy at all-times. Paul found reason to unveil testimonies of generosity: "We want you to know brothers, about the grace of God that has been given among the churches of Macedonia, for in a severe test of affliction, their abundance of joy and extreme poverty have overflowed in a wealth of generosity on their part" (II Cor. 8:1-2). And: "I know your readiness [Corinthians], of which I boast about you to the people of Macedonia, saying that Achaia [the region in which Corinth resides] has been ready since last year. And your zeal has stirred them up" (II Cor. 9:2). Testimonies of generosity have tremendous potential to stir up others to respond with generosity of their own.
Click Here to read: "Should my Giving be a Secret?"