Taking the Lord's Name in Vain

Jephthah exemplifies this commandment for me. I know that too often, I try to promise God things, try to dedicate myself to disciplines and issues that promote the kingdom or develop discipleship, knowing that I'm probably not going to go through with it - things like doing devotions every day, or tithing, or what not. I've never felt that taking the Lord's name in vain was really about swearing; really, it's about making rash promises that you don't take seriously. If Jephthah had known that his daughter would be taken from him because of the vow he made to God, would he have made it? I'm impressed that he honored it. Just more proof that we shouldn't take our commitment to our God lightly...