On a side note, I personally think it is a wise thing to check our hearts. I know from experience, that if I ignore my inner thought life, my thinking can go askew. Unhealthy thinking can fester and before long our thought life can do downhill. If you are struggling, confide in someone that has a listening ear, and that can offer you sound counsel.
Therefore we do not lose heart. Though outwardly we are wasting away, yet inwardly we are being renewed day by day. For our light and momentary troubles are achieving for us an eternal glory that far outweighs them all. So we fix our eyes not on what is seen, but on what is unseen, since what is seen is temporary, but what is unseen is eternal.
2 Corinthians 16-18