You will know...

... that when you pray and pray but nothing is happening, this means you need to pray even harder...

... that when your breakthrough is finally coming because this is when the devil is extremely panicky, doing even stupider things, hopefully trying to stop that breakthrough from coming...

... that when God is moving in your life, this is when things your don't expect will happen and it can only be God that these things happen...

... that when your spiritual health is not really doing very well when you get distracted by tiny, tiny things...

... that you know when you finally return to God, really desiring His touch all over again, really thirsting for His presence, He will still overwhelm you with His love...