Deuteronomy 4:29 Halakhah

וּבִקַּשְׁתֶּ֥ם מִשָּׁ֛ם אֶת־יְהוָ֥ה אֱלֹהֶ֖יךָ וּמָצָ֑אתָ כִּ֣י תִדְרְשֶׁ֔נּוּ בְּכָל־לְבָבְךָ֖ וּבְכָל־נַפְשֶֽׁךָ׃

But from thence ye will seek the LORD thy God; and thou shalt find Him, if thou search after Him with all thy heart and with all thy soul.

Read halakhic rulings (Jewish law) on Deuteronomy 4:29: and classical halakhic sources.