I find it pretty easy to deceive myself. Fortunately, the more I study the Holy Bible, the harder it gets. Thank God, one of the things I do best is not giving up.

Galatians 6:7-9
Do not be deceived: God is not mocked, for whatever one sows, that will he also reap.
For the one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.
And let us not grow weary of doing good, for in due season we will reap, if we do not give up.
Bible Gateway link: Galatians 6:7-9 (ESV)