Matthew 12:34

O ye generations of vipers, how are you, being evil, able to speak good things? for out of the abundance of the heart the mouth speaks.

2 Corinthians 8:12

For if there is first a willing mind, it is acceptable according to what one may have, and not according to what he has not.

2 Corinthians 9:7

As each one has predetermined in his heart; not of reluctance, or of constraint: for God loves the hilarious giver.

Treasury of Scripture Knowledge

Summary

And they came, every one whose heart stirred him up, and every one whom his spirit made willing, and they brought the LORD'S offering to the work of the tabernacle of the congregation, and for all his service, and for the holy garments.

Bible References

General references

Matthew 12:34
O ye generations of vipers, how are you, being evil, able to speak good things? for out of the abundance of the heart the mouth speaks.
2 Corinthians 8:12
For if there is first a willing mind, it is acceptable according to what one may have, and not according to what he has not.
2 Corinthians 9:7
As each one has predetermined in his heart; not of reluctance, or of constraint: for God loves the hilarious giver.