I spent many summers on Kentucky Lake. Peepaw had a boat and Jet Ski. Numerous memories were made on the water. We would take the boat out almost daily. My job was to tie the boat to a tree whenever we returned.
It was a small job, but important. If the boast was not tied down it would drift away. It would hardly be noticeable really. Given enough time though and the boat would drift out of sight.
Drifting away is used by the writer of Hebrews. This imagery of a boat drifting into the sea was to remind Christians of what can happen when we are not diligent.
For this reason we must pay careful attention to what we have heard, unless we drift away (Hebrews 2:1).
Notice it is not willful sin. It is not stubborn rebellion. Instead it is a lack of urgency and diligence. The point is we must be intentional about our faith. Going through the motions is disastrous. You drift, drift, and drift until you cannot see the shore. Today decide to be diligent. Decide to be urgent. Decide to pay attention to what you have learned. Decide to pay careful attention.