The Prophet (peace be upon him) said,
“God will suffice he, who makes his worry in life one; and he, who is branched by worries, God will not care in whichever valley of life he perishes.”
[Al-Hakim reports in al-Mustadrak]
The meaning of this is that one should concentrate one’s worries from beginning to end on obeying Allah (subhanahu wa ta`ala) and preparing oneself for his meeting, for this is the greatest of all worries, and the greatest of all matters.
For this very reason messengers were sent, and books were revealed, and the trade of Paradise and Hell was set, and the Siraat (the bridge over Hellfire) was laid down, and for which the Scale was put forth.
He who Allah made to see and awakened his heart, gathers his concerns and directs his thought towards the meeting with his creator and master. For this matter is enough to engage one and exhaust all the rest.
Furthermore, the more life enters the heart the more the worry and the preparation. You will not find a man knowledgeable in his religion, sound in his mind but had gathered his soul in this very worry. He would not work, stand nor sit down but in awe of God, unique in his highness and the greatest of all duties ordained. His senses would be directed to serving his master and his tongue would only speak of his praise, and his heart would beat with gratitude, and his eyes would show his deep love with truthful tears.
As for he who channels his worries in all matters of life, don’t ask about his well-being, for he is anxious, disturbed, perplexed, sorrowful and lost without any sort of benefit. He is forever in continuous sadness because whoever falls in love with life is killed and who lusts for it will fall sick and who serves it will end up disappointed.