'Heart' in the Bible

I was forty years old when Moses the servant of the Lord sent me from Kadesh-barnea to scout the land [of Canaan], and I brought a report back to him as it was in my heart.

Only be very careful and diligently observe the commandment and the law which Moses the servant of the Lord has commanded you to love the Lord your God and walk in all His ways and keep His commandments and hold fast to Him and serve Him with all your heart and with all your soul [your very life].”