All Christians should be As Missionaries with a Willing Heart
Source: TTT
Exodus 35:29
So all the men and women of the Israelites whose hearts prompted them brought a freewill offering to the LORD for all the work that the LORD through Moses had commanded them to do.
1 Chronicles 29:9, 14
And the people rejoiced at the willing response of their leaders, for they had given to the LORD freely and wholeheartedly. And King David also rejoiced greatly. / But who am I, and who are my people, that we should be able to give as generously as this? For everything comes from You, and from Your own hand we have given to You.