And ye shall seek me, and find me, when ye shall search for me with all your heart. [Jeremiah 29:13 KJV]
John Calvin says the following on the above text :
This then is the reason why the Prophet employs many words on this subject. By the word seek, he means prayers and supplications, as mentioned in the last verse. And Christ also, exhorting his disciples to pray, says, “Seek and ye shall find, knock and it shall be opened to you.” There is no doubt but that he speaks there of prayer; he yet adopted various modes of speaking, derived from the common habits of men. But to seek, when we feel the need of God’s grace, is nothing else than to pray. Hence the Prophet says, ye shall seek me and ye shall find me And though he addresses here the Israelites, yet this doctrine ought to be extended to the whole Church; for God testifies that he will be propitious to all who flee to him.
Calvin points out that Jesus re-iterates the words of Jeremiah when he says 'Seek and ye shall find'.
Jesus goes further and stresses that the seeking of God must be that above which all else is to be subservient.
'Seek ye first the kingdom of God and His Righteousness' he tells us, Matthew 6:13, KJV, and that even the thought of what one shall eat tomorrow is to be put out of the mind, that one may concentrate on what should be uppermost.
And we are not to seek our own righteousness, we are to seek God's kingdom and His Righteousness.
More could be said. Much more could be said. And more is said, sixty six whole books are given us (I speak of the Protestant canon, in context) which, summed up, are the seeking and finding of God himself.
As to the finding of God : the reward of finding God . . . is to find God.
I am thy shield and thine exceeding great reward [Genesis 15:1 KJV]
They who find God, know God.
That knowledge is experimental. It cannot be described.
It is to be experienced by every successful finder.