Passage
Thus you shall know in your heart that Yahweh your God was disciplining you just as a man disciplines his son.
Deuteronomy 8:5 (LSB)
Nearby Context
Deuteronomy 8:3 And He humbled you and let you be hungry and fed you with manna which you did not know, nor did your fathers know, that He might make you know that man does not live by bread alone, but by everything that proceeds out of the mouth of Yahweh.
Deuteronomy 8:4 Your clothing did not wear out on you, nor did your foot swell these forty years.
Deuteronomy 8:5 Thus you shall know in your heart that Yahweh your God was disciplining you just as a man disciplines his son.
Deuteronomy 8:6 So you shall keep the commandments of Yahweh your God, to walk in His ways and to fear Him.
Deuteronomy 8:7 For Yahweh your God is bringing you into a good land, a land of brooks of water, of fountains and springs, flowing forth in valleys and hills;
Study Lenses
The verse centers on "thus", "shall", "heart", "yahweh", "disciplining", "just", and "disciplines". It is saying that the verse draws attention to "thus" and "shall", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 4's "Your clothing did not wear out on..." into verse 6's "So you shall keep the commandments of...", so "thus" and "shall" belong inside that flow. In Deuteronomy context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "thus" and "shall" with trust shaped by these words, not by a vague optimism outside the passage.