There is a [Hadith] which says: Mutu qabla an tamutu, which means, 'Die before death.' A poet says, 'Only he attains to the peace of the Lord who loses himself.' God said to Moses, 'No man shall see me and live.' To see God we must be non-existent.
What does all this mean? It means that when we see our being with open eyes, we see that there are two aspects to our being: the false and the true. The false life is that of the body and mind, which only exists as long as the life is within. In the absence of that life the body cannot go on. We mistake the true life for the false, and the false for the true.
Dying is this: when there is a fruit or something sweet and good to taste, the child comes to its mother and says, 'Will you give it to me?' Although it would have given pleasure to the mother to eat it, she gives it to the child. The eating of it by the child is enjoyed by the mother. That is death. She enjoys her life in the joy of another. Those who rejoice in the joy of another, though at their own expense, have taken the first step towards true life. If we are pleased by giving another a good coat, which we would have liked to wear ourselves, if we enjoy that, we are on the first step. If we enjoy a beautiful thing so much that we would like to have it, and then give that joy to another, enjoying it through his experience, we are dead. That is our death. Yet, we live more than he. Our life is much vaster, deeper, greater.
Seemingly it is a renunciation, an annihilation, but in truth it is a mastery. The real meaning of crucifixion is to crucify this false self, and so resurrect the true self. As long as the false self is not crucified, the true self is still not realized. By Sufis it is called Fana, annihilation. All the attempts made by true sages and seekers after real truth are for the one aim of attaining to everlasting life.
https://wahiduddin.net/mv2/VII/VII_26.htm