Feeling stressed, tired, fatigued, rushed, drained and zapped? If so your output is likely at zero.  Whatever your input directly affects your output. High productivity requires good health, disciple, determination, focus, deadlines and commitment.

But above all it takes stamina and determination.

If you do not really care if you climb that mountain you will never see the world from the top and if you convince yourself that you will never finish writing your book then you likely never will see it in print.

If you are determined to succeed then you will and if you really want to write that book you will find the time.