Ephesians 1:13-14 (KJV) (13) In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise, (14) Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.
You trusted in Jesus after you heard the Word of Truth. That Word of Truth is the message of Jesus and His crucifixion. Also, when you believed, you were sealed with the Holy Ghost. This is the down payment of our promise. This guarantees that we will receive our complete inheritance at the Resurrection. It was totally purchased by the blood of Jesus, and will be completely fulfilled at the Resurrection.
(Read Romans 8:23)