I can only comment from personal experience. I was in a bad state for a long time and did not only consider it, but attempted it. Without success !! You must realise that that was a bit of a low point in my life - not having success in comitting suicide! What a loser!!
To this day, I cannot say why I did what happens next, but here goes: I sat down in the sun on the bedroom floor and started talking to God. Told him that I do not see my way clear to continue. I was worthless. Then, without thinking about it, just started naming each one of my sins by name (every one that I could think of) and asked forgiveness in the name of Jesus (who died for my sins). It was not a mechanical exercise but a deep realisation of my sins before God. That is the first step to reconcilliation with God. When I got up, depression was gone, and it felt (really) as if a ton of bricks have been lifted. This is now about 6 or 7 years ago, and no further problems.
Soon after this experience, I got diagnosed with cancer. That has been one of the most blessed times of my life !! It was no ordeal as I could not lose. If I died, I will be with Jesus, If I lived, well that would be really nice as well. Still have to go for check-ups every year, but so far - so good!!
To say my life has been easy since then, would be a lie. My financial status is much worse. But I do what I can and trust God.
I would not suggest that your friend must follow step 1, sit down. Step 2 etc. God brings us tp places in our lives that He wants us. What is happening to him, is not mere chance or bad luck. All is in the hands of God - He is almighty. Some of us are real stupid and He has to speak loud!!
He wants to heal us, but we must not think that by our human endeavour, we will achieve anything. It is by grace that we are saved and sins forgiven. It is a great opportunity, but he may still reject it.
No telling him good stories or "It will be OK" is going to work on the long term. God will cure him/her in His good time. It may be immediate, it may take time - but trust God and in Jesus' blood that was spent for all. Jesus invites him/her:
Mat 11:28 Come unto me, all ye that labour and are heavy laden, and I will give you rest.
Mat 11:29 Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.
Mat 11:30 For my yoke is easy, and my burden is light.