I know also, my God, that thou triest the heart, and hast pleasure in uprightness. As for me, in the uprightness of my heart I have willingly offered all these things: and now have I seen with joy thy people, that are present here, offer willingly unto thee.
1 Chronicles 29:15 For we are strangers before thee, and sojourners, as all our fathers were: our days on the earth are as a shadow, and there is no abiding.
1 Chronicles 29:16 O Jehovah our God, all this store that we have prepared to build thee a house for thy holy name cometh of thy hand, and is all thine own.
1 Chronicles 29:17 I know also, my God, that thou triest the heart, and hast pleasure in uprightness. As for me, in the uprightness of my heart I have willingly offered all these things: and now have I seen with joy thy people, that are present here, offer willingly unto thee.
1 Chronicles 29:18 O Jehovah, the God of Abraham, of Isaac, and of Israel, our fathers, keep this for ever in the imagination of the thoughts of the heart of thy people, and prepare their heart unto thee;
1 Chronicles 29:19 and give unto Solomon my son a perfect heart, to keep thy commandments, thy testimonies, and thy statutes, and to do all these things, and to build the palace, for which I have made provision.
The verse centers on "thou", "triest", "heart", "hast", "pleasure", and "uprightness". It is saying that the verse draws attention to "thou" and "triest", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 16's "O Jehovah our God all this store..." into verse 18's "O Jehovah the God of Abraham of...", so "thou" and "triest" belong inside that flow. In 1 Chronicles context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "thou" and "triest" with trust shaped by these words, not by a vague optimism outside the passage.