 I have been a pastor for over 40 years. Having started an independent church as a rejection of the legalism in the church I left I did not teach on tithing and still don`t except on rare occasions. ><p>
What I do say from the pulpit is that I have tithed since I was 12 yrs old and I can say without reservation that God has rebuked the devour in my life. 
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We can never know how things would have gone had a different path been taken, but the protection of God from the devourer and His generous provision for all my needs are <b>not</b> just ~good luck~. 
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There are some extremely important principles folded into the 10% concept. 
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First, it makes you think about the totality of your increase (which all comes from God). 
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Secondly, it leads you to be accountable for that increase: ~OK, 10% goes to God and I need to save some and I must pay this,...etc.~ 
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Thirdly, it introduces you to God`s great principle of sowing and reaping. 
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Will ~not tithing~ send a person to hell? Of course not. But neither will ~not prayng~ and ~not reading the Word~. 
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We are to walk by Faith, in the Spirit. <br>Forming good habits like praying, reading the Word, assembling together and tithing help us connect our spiritual selves to the physical world which we navigate.