Suicide is not leaning on Jesus for today and tomorrow. We are still His as we have been bought with a price and sealed as His, but anyone considering suicide is robbing them of the chance of any joy in seeing how Jesus can help them walk through this valley of death. Suicide may take a believer to the point of ending their lives when they should be coming to the end of themselves in every way to the point of saying as the poor in spirit will say to Jesus..." I give up God. I have made mistakes that I cannot undo. I have lost all drive for this life. I am sick of the pain and the alienation and the attacks from the devil. You take it Lord. Deal with my life as you have promised for I cannot handle it anymore." If you really think about it, most saints are going through this in one form or fashion.. some even worse than others and are joyful in their trials. Weird.. I know, but it all has to deal with getting to know Him and the power of His resurrection.. having fellowship in His sufferings... and seeing how the just are living by faith what they cannot see for their lives to be worth living for, but God is with us, and the adventure of going through this valley of death will not come again for we are Heaven bound. What better way to praise God in Heaven other than to know what He has done to help us through this valley of death.
And when He does turn your life around to where He does not allow the trials of this life to get you down, remember to give thanks.
As for those suffering over the loss of a loved one, Jesus said He will lose nothing all that was given to Him. That is the will of the Father.
John 6: 38For I came down from heaven, not to do mine own will, but the will of him that sent me. 39And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day. 40And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.