The tried and true are coming forth with great expectation in their hearts and they will tear down the Kingdom of Darkness on all sides because they know whom they serve and whom they belong to.  There will be no hesitation on their parts as what they can do.  They know without a shadow of a doubt that they serve a miracle working God and they expect miracles to occur.  There is absolutely nothing that will deter them from doing the Greater Works of the Father.

Hebrews 11:1
1 Now faith is confidence in what we hope for and assurance about what we do not see

Isaiah 48:10
10 See, I have refined you, though not as silver; I have tested you in the furnace of affliction.