1. We ought to pray for ALL men - "I exhort therefore, that, first of all, supplications, prayers, intercessions, and giving of thanks, be made for all men;" ( 1 Tim. 2:1) the 2nd verse includes kings and ALL that are in authority.
2. We ought to pray for ALL saints - "Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;" (Eph. 6:18). This verse has alot of 'alls' in it. I grew up in a religion where the beatified 'saints' pray for us, but the Bible is clear, anyone one in Christ is a saint. Therefore we can and should pray for the saints.
3. We ought to ALWAYS direct our prayers to God with Thanksgiving - "We give thanks to God always for you all, making mention of you in our prayers;" ( 1 Thess. 1:2) (see also Col. 1:3).