The Father search the heart

[Jer. 17:7] Blessed is the man that trusteth in the LORD, and whose hope the LORD is.
[(Psalm 34:8; Proverbs 16:20; Isaiah 30:18). Jeremiah first removed the weeds (false trusts), so that there might be room for the good grain.
Truseth in the Father - In the Word of the Father, as the in the Messiah, the essential Word of the Father; Psalm 2:12 who have a spiritual knowledge of Him, and so trust in Him, Psalm 9:10 who have seen the vanity and emptiness of all other objects of trust, there being no salvation in them, only in Him; who take themselves to Him as their only refuge; lay hold, rest, and rely upon Him, as their Savior; commit their all unto Him; trust Him with all their concerns, respecting life and salvation, and with their immortal souls; and expect all from Him, grace here, and glory hereafter: who trust in His person for their acceptance with G-d; in His righteousness for their justification; in His blood for the pardon of their sins; in His fullness for the supply of their wants; in His power for protection and preservation; and in all for eternal life and happiness: and such are blessed persons; for they are in the utmost safety; they are as Mount Zion, which can never be removed; they shall want no good thing, temporal or spiritual, proper for them; they enjoy great peace now, and in the world to come everlasting glory.
Whose hope the Father is; the Word of the Father, as before: the Messiah, who is the Hope of Israel, our hope, and Messiah in us the hope of glory, Jer. 14:8, whose hope is from the Father, of which He is the author and giver; and is a good hope, through His grace; and which has the L-rd Y'Shua HaMashiach for its object; who turn in to Him as prisoners of hope; and lay hold on Him, the hope set before them; and do hope in Him for pardoning mercy, salvation, and eternal life. Blessed mankind! their hope shall not make them ashamed; they shall not be disappointed, Psalm 146:5.]
[8] For he shall be as a tree planted by the waters, and that spreadeth out her roots by the river, and shall not see when heat cometh, but her leaf shall be green; and shall not be careful in the year of drought, neither shall cease from yielding fruit.
[Shall not see - that is, feel. Answering to Jer.17:6; whereas the unbelievers “shall not see (even) when good cometh,” the believer “shall not see (so as to be overwhelmed by it even) when heat (fiery trial) cometh.” Trials shall come upon him as on all, nay, upon him especially (Hebrews 12:6); but he shall not sink under them, because the L-rd is his secret strength, just as the “roots spread out by a river” draw hidden support from it (2 Corinthians 4:8-11).]
[10] I the Father search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.