1 Chronicles 29:17 - Joseph Benson’s Commentary on the Old and New Testaments

I know also, my God, that thou triest the heart, &c. That thou observest with what intention and disposition of mind any offering is made and work performed; and hast pleasure in uprightness Without which the most costly gift, and most laborious services, would be as nothing before thee. And hence it is that I hope thou wilt be pleased to accept what I now present to thee, being conscious that I offer it with a heart devoted to thy love and service, and with an intention to glorify thee. It is a great satisfaction to a good man to know that God tries the heart, and has pleasure in uprightness; and that whoever may misinterpret or contemn it, he is acquainted with, and approves, the way of the righteous. It was a comfort to David that God knew with what pleasure he both offered his own, and saw the people's offering. I have seen with joy thy people offer willingly unto thee By the largeness of their offering I discern the sincerity, willingness, and generosity of their hearts toward thee: for David judged, as in reason and charity he ought, of the tree by its fruit, and of their hearts by their actions.