Our Peace, doesn’t come from our own perfection, but from our Faith in the perfect one, in Jesus. We must take the focus off of ourselves, and on Jesus. If we don’t, we will not find the peace, we are looking for. We will become like the double minded man, in James 1 (see notes below)

Arw27

From John MacArthur Study Bible

26:1–4 The redeemed remnant will sing praise to God over their impregnable city, Jerusalem. ‡ 26:1 strong city. In contrast to the typical city of confusion (24:10; 25:2; 26:5) that was doomed, God has a future city of prominence, the millennial Jerusalem (Zec 14:11). † 26:2 Open the gates. Isaiah envisions the future Jerusalem, where only righteous Israel may enter. The redeemed remnant from other nations will come periodically to worship (Zec 14:16–19). † 26:3 perfect peace … trusts in You. A fixed disposition of trust in the Lord brings a peace that the wicked can never know (48:22; 57:21). Such reliance precludes double mindedness (Jas 1:6–8) and serving two masters (Mt 6:24). † 26:4 everlasting Rock. Lit. the expression is “Rock of Ages,” a rocky cliff where the trusting one may find shelter from attackers (cf. 12:2). † 26:5, 6 those who dwell on high … afflicted. The arrogant inhabit the lofty city during its overthrow; the humble inhabit the strong city (v. 1) in its exaltation (cf. Jas 1:9, 10; 1Pe 5:5).