Hebrews 4:3,9

For we who have believed do enter that rest, as He has said: “So I swore in My wrath, ‘They shall not enter My rest,'” although the works were finished from the foundation of the world. There remains, therefore a rest for the people of God.

We enter into rest when we believe, pray, and know with the word that God is working on our behalf.  We do not try to fix the problem ourselves but rest as God goes to work for us.  God finished the work at the foundation of the earth.  Our job is to trust in Him and remain in faith.