Matthew Poole and continuators on Jeremiah 4:14

O Jerusalem, wash thine heart from wickedness , that thou mayst be saved : how long shall thy vain thoughts lodge within thee?

Cleanse your inward part, O ye men of Ierusalem, not your hands only, as hypocrites do, but your hearts, Iames 4.8. the same exhortation with verse 3.4. only in another Metaphor of washing, which seems to be taken from such Potions, that Physitians give to clear the inward parts from noxious humours, see Isa. 1.16, 17.

Viz. From all filthiness of Flesh and Spirit, 2 Cor. 7.1. Iames 1.21.

This hath reference in this place to Temporal Salvation; it is prescribed as a means to prevent the judgments that are impending on them, as is plainly expressed verse 4. yet not exclusive of Spiritual Salvation, 2 Thes. 2.13. Tit. 3.5.

Wicked thoughts, or rather hopes, or expectation from any helps, chap. 2.5▪ 37. pleasing thy self with vain fancies of safety and security, which thoughts of thine will assuredly bring ruine and misery upon thee, which is inevitably coming, as in the next verse.