Presumption

Psalm 19:13
Keep back Your servant also from presumptuous sins; Let them not have dominion over me. Then I shall be blameless, And I shall be innocent of great transgression.

Presumptuous in the Hebrew is zed, Strongs #2086 which means:
1) arrogant, proud, insolent, presumptuous
a) the arrogant ones (as n coll pl)
b) presumptuous (as adj)

The Collegate Dictionary says this about presumptuous:
Overwhelmingly proud, self confident or venturesome, taking undue liberties, overbold.

In the following verse 14 it tells us:
Let the words of my mouth and the meditation of my heart Be acceptable in Your sight, O LORD, my strength and my Redeemer.

This is letting us know how we can avoid presumptuous sin, by examining the meditation of our heart, and filtering it through the Lord to make it acceptable to Him. Renewing our mind to the Word of God will be helping us along our way. "What does God say about this?".

Faith is not presumption. Presumption is not faith.

Authentic faith is founded on the promises of God in His Word; it is not presumptuous. "Presumptuous" ideas about faith lead to attidudinal or behavioral sin; to missing the mark of faith's true meaning.
Presumptuous attitudes are present when, in the name of "faith," a person either::
1. Thinks "faith" is wishful thinking or a fanciful attitude, assuming God should relieve all their discomfort and "jump" to their request; or

2. Rejects any responsibility on their part to offer a devoted heart and the commitment to serve Him regardless of their life condition.

Presumption desires the promise of God without living a life for God and is hypocritical in His sight.

To protect from a presumptuous attitude:
1. Root your faith in what God in Christ has provided in His redemption, not on what you might gain through presumptuous "faith" exercises
Galatians 2:20
I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me.

2. Develop your own personal faith, and do not attempt to live off another's faith (as, for example, Sceva's sons did - (Acts 19:14-16)

3. Walk in a faith, growing in an intimate relationship with the Author and Finisher of our faith, so that you are known as His, and found in Him

Hebrews 12:2)
looking unto Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.

John 10:27)
My sheep hear My voice, and I know them, and they follow Me.

Philippians 3:9)
and be found in Him, not having my own righteousness, which is from the law, but that which is through faith in Christ, the righteousness which is from God by faith

In a commentary to this passage, it noted that presumption is fighting against God to dare Him to do His worst. Willful sin - blasphemy. The sentence that is past on it is dreadful, they will be cut off, as a deleberate law breaker.

What came to my mind after reading this was the account in Leviticus 10 when Aarons sons did what they wanted in the temple, it cost them their lives.
Also the account of Ananias, with his wife Sapphira when they lied to the Holy Spirit in Acts 5, it also cost them their lives.

II Peter 2:9,10, tells us:
9 then the Lord knows how to deliver the godly out of temptations and to reserve the unjust under punishment for the day of judgment,
10 and especially those who walk according to the flesh in the lust of uncleanness and despise authority. They are presumptuous, self-willed. They are not afraid to speak evil of dignitaries,
11 whereas angels, who are greater in power and might, do not bring a reviling accusation against them before the Lord.
12 But these, like natural brute beasts made to be caught and destroyed, speak evil of the things they do not understand, and will utterly perish in their own corruption,
13 and will receive the wages of unrighteousness, as those who count it pleasure to carouse in the daytime. They are spots and blemishes, carousing in their own deceptions while they feast with you

In Numbers 15:30, 31, we're told about what God thinks about pesumptuous sin.
30 'But the person who does anything presumptuously, whether he is native-born or a stranger, that one brings reproach on the LORD, and he shall be cut off from among his people.
31 Because he has despised the word of the LORD, and has broken His commandment, that person shall be completely cut off; his guilt shall be upon him.' "

God HELP US not to be high handed, proud, arrogant puffed up, insolent. Help us not to dispise Your Word. HELP US to meditate on Your Word - Let the words of my mouth and the meditation of my heart Be acceptable in Your sight. Father, it is our desire to live our lives honorably, to please You and to bring every thought captive to the knowledge of Your Word. We LOVE YOU Lord, thank You for hearing the cry of our hearts, in the Name of Jesus.