Amos3:3 Can two walk together except they be agreed?
If you want to rent an apartment in my country, there is always an agreement paper to be signed by you. The agreement paper clearly states the terms and conditions attached to living in that house, what the landlord expect from you, if you append your signature on the agreement book, it means you have a deal.
God is also not foolish, he expects that in areas of our lives where we shall deal with people, there should be word-based agreement. If you want to marry, there must be agreement between you and the person you want to marry. I have seen would-be couples break their relationships because they couldn't agree on certain things. It is better to break such relationships than manage it. I have seen people break relationship because their beliefs on tithing wasn't the same.
One of the salient secrets of a happy home is when both partners have the same mind and focus on matters that pertains to them. Do not be foolish one more day, let their be terms for any engagement either in business, marriage or ministry. Do you know that when you want to pray with someone, if both of you do not agree in faith, your prayers is a waste?
When holding hands to pray with someone, ensure there's an agreement, that's how to make Matthew18:19 work.
Father, I refuse to be foolish and I exercise the power of agreement henceforth In Jesus name. Amen