Hebrews 3:19So we see that they were not able to enter [into His rest], because of their unwillingness to adhere to and trust in and rely on God [unbelief had shut them out]. (amplified version)

Rest is a gift, a promise extented, a choice offered. At the end of trust lies rest, when your heart can not take another blow, your eyes are raw from tears, your feet weary from the journey, you find not the broken edges of dreams but rest. the chance to realise it never was with in your control.