1 Chronicles 28:9

9 But thou, Solomon, my son, know [thou] the God of thy father, and serve thou him with (a) perfect heart, and with a willful soul, or mind (and with a willing mind); for the Lord searcheth all hearts, and he understandeth all the thoughts of souls; if thou seekest him, thou shalt find him; forsooth if thou forsakest him, he shall cast thee away without end.

1 Chronicles 28:9 Meaning and Commentary

1 Chronicles 28:9

And thou, Solomon my son
Who was present in this assembly, and presented to them by David as his successor, and their future king: and having addressed them, he turns himself to him, and exhorts him, saying,

know thou the God of thy father;
who was his Father and covenant God, and whom he served and worshipped, and who had bestowed upon him many favours, both temporal and spiritual; and having had such an experience of his goodness, he exhorts his son to seek to know more and more of him, and to own and acknowledge him as his God, and to love and fear him:

serve him with a perfect heart, and with a willing mind;
cordially and sincerely, cheerfully and freely, neither in an hypocritical manner, nor through force and constraint, nor with loathing and weariness:

for the Lord searcheth all hearts;
the hearts of all men, even of kings, and knows from what principles and with what views and in what manor they serve him:

and understandeth all the imaginations of the thought;
not only the thoughts of the heart, when regularly formed and ranged in order, hut even the very beginning of them, the first motions of the mind, and before they are well formed, see ( Genesis 6:5 ) ( Psalms 139:2 )

if thou seek him;
by prayer and supplication in his house and ordinances:

he will be found of thee;
grant his presence and bestow his favours, see ( Isaiah 4:6 )

but if thou forsake him:
his word, his ways, his worship:

he will cast thee off for ever;
from being king, or enjoying that peace, prosperity, and happiness, which otherwise would be enjoyed.

1 Chronicles 28:9 In-Context

7 and I shall make steadfast his realm into without end, if he shall continue to do my behests and [my] dooms, as and today. (and I shall establish his kingdom forevermore, if he shall continue to do my commands and my judgements/if he shall continue to obey my commands and my laws, as in this day.)

8 Now therefore before all the company of Israel, (and) in the hearing of God, (I say,) keep ye and seek ye all the commandments of your Lord God (obey ye and seek ye to understand all the commands of the Lord your God), (so) that ye (can) have in possession a good land, and that ye leave it to your sons after you into without end.

9 But thou, Solomon, my son, know [thou] the God of thy father, and serve thou him with (a) perfect heart, and with a willful soul, or mind (and with a willing mind); for the Lord searcheth all hearts, and he understandeth all the thoughts of souls; if thou seekest him, thou shalt find him; forsooth if thou forsakest him, he shall cast thee away without end.

10 Now therefore, for the Lord hath chosen thee, for to build the house of [the] saintuary, be thou comforted, and perform it. (And so now, for the Lord hath chosen thee, to build the House of the sanctuary, be thou strengthened, and do it.)

11 And David gave to Solomon, his son, the describing, either the ensample, of the porch of the temple, and of [the] cellars, and of the solar, and of [the] closets in (the) privy places, and of the house of propitiation, or of mercy doing, that is, of the holy of holy things, where the propitiatory was;