With all your heart, might, mind and strength....

"Whatever name you give it - will, steady purpose, or one-pointedness of the mind - you come back to earnestness, sincerity, honesty.  When you are in dead earnest, you bend every incident, every second of your life to your purpose.  You do not waste time and energy on other things.  You are totally dedicated, call it will, love or plain honesty.  We are complex beings, at war within and without.  We contradict ourselves all the time, undoing today the work of yesterday.  No wonder we are stuck.  A little integrity would make a lot of difference."

Sri Nisargadatta Maharaj
I Am That

Later he sums up the point he is trying to make -

"Desire determines destiny."

D&C 137:9

9 For I, the Lord, will judge all men according to their works, according to the desire of their hearts.