...so she said to Abram, "The LORD has kept me from having children. Go, sleep with my maidservant; perhaps I can build a family through her." Abram agreed to what Sarai said (Genesis 16:2).
Presumption is assuming that we are to take action that we believe is faith but is actually based on our own reasoning. Abraham and Sarah fell into presumption when they got too old to have children. God had promised a son to Abraham and Sarai who would fulfill God's promise to birth a nation. But Abraham and Sarah were now past the normal age for child bearing. So, they concluded God needed help to work out His plan.
Many of us business people make the same mistake every day. We make assumptions about what we believe God is doing and wants us to do. However, before we really have full assurance that God has spoken to us on the matter and revealed His perfect action plan, we move forward with our steps to get it done. How do we protect ourselves from presumption? The proverbs tell us "There is safety in a multitude of counselors." Submitting our decisions to others for confirmation protects each of us from the deceit of our own heart. This process will protect us from presumption and encourage us to move in faith. The next time you believe God is directing you toward a specific action, consult with your spouse first, then some close, spiritual friends who will take the time to prayerfully consider your request. If you don't have consensus, wait until you do before you move forward. God will move through this process to His desired will for the matter.