Bottom line: Let's prioritize our generosity toward God because God has been generous toward us.
God lays our three principles of generosity when He asks the Jews to bring an offering for the construction of the tabernacle.
1) The principle of how: We are to give generously (willingly) from the heart.
2) The principle of what: We are to give generously to the Lord what He has first generously given to us.
3) The principle of why: We are to give generously so that the purpose(s) of the Lord can be accomplished.
Generosity should mark us as God's children because as God's children we've been marked by God's generosity.