It kinda goes along with abortion....you do not have the choice to take away a life..let alone your own. Suicide is something someone does to not face their own battles.
Now i'll give you a simple, yet probably unrealistic example...but hopefully this gives u an idea of why Suicide is wrong.
In most cases...people who commit suicide are those who have been struggling in life with whatever reason...correct?
Well take Jesus for example, when he was captured by the people and sentenced to Crucification...what did he do? Did Jesus turn his head, and give up easily...i'm sure he could have...right? Suicide is the easy way out...something Satan wants you to do. But look at Jesus, the suffering he went through...for YOU and Me! He stuck with his problems and suffering right to the end, because he loved us that much.
So if you are struggling...well you need to ask yourself...What would Jesus do? Suicide is not something God wants you to do, he wants us to face our fears and struggles just like Jesus faced his
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Hopefully that sheds some light on the issue, i'm currious to read some others opinions.