Self-love is the root and cause of all evil; it snatches away all that is good and all that is perfect. Therefore if the soul is to know God, it must also forget itself and lose itself. For as long as it sees itself, it will not see and know God. But when it loses itself for God’s sake and leaves all things, then it finds itself again in God because God dawns upon it – and only then does the soul know itself and all things in God.
Source: Freedom from Sinful Thoughts