As you probably know that I am not a believer of tithing and think that it is unbiblical for us as new testament
christians to be under any compulsion to do so.
But here is a thought anyway. Is giving freely harder than tithing. Why do I ask? Because if a certain percentage is not specified, then surely what you do give, or if I am more specific, HOW you give exposes more about your heart. You see, you can have a person who pays his tithes every month without fail and it still can be unacceptable to God, where on the other hand, you may have a person who gives less than 10% and it can be totally acceptable to God because he gave with the right heart and the right motives. So I would argue that it is harder to give freely from your heart than a person telling you an amount or percentage to give and I believe that this is at the heart of why God has chosen this method of giving for new testament believers rather then tithing. Its all about our hearts. How we give and our motives for giving reveals a lot about our hearts.