'Heart' in the Bible

'Thou dost not hate thy brother in thy heart; thou dost certainly reprove thy fellow, and not suffer sin on him.

And those who are left of you -- I have also brought a faintness into their heart in the lands of their enemies, and the sound of a leaf driven away hath pursued them, and they have fled -- flight from a sword -- and they have fallen, and there is none pursuing.

also I walk to them in opposition, and have brought them into the land of their enemies -- or then their uncircumcised heart is humbled, and then they accept the punishment of their iniquity, --