We can deceive people in our worship, but God sees our heart—not just our words and actions. How often do we truly think of this during the day? (Because worship is not just limited to church-time)
If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there. If I take the wings of the morning, and dwell in the uttermost parts of the sea; Even there shall thy hand lead me, and thy right hand shall hold me. Psalm 139:8-10
Even there... There is no place too sorrowful, no place too hard, no place too confusing, no place too tempting, but God is there to lead and hold us. He thinks of us more than there are grains of sand (vs. 17-19). There is nothing that we can go through which He does not know of or won’t be there for. Even there... God is there.
The Old Testament is the foundation of the New Testament and Jesus’ teachings. We cannot accept Jesus’ teachings then reject the Old Testament (specifically mentioned here: Genesis-Deuteronomy, which covers creation, the world-wide flood, confusion of languages, Israel redeemed from Egypt, and the law—God’s standard for holiness). If we believe Jesus to be true, then we’d better believe the Old Testament, because He endorsed it.
What Old Testament promises comfort you as a New Testament believer?