Exodus 15 is a whole chapter devoted to a song of praise. The Israelites were celebrating their miraculous deliverance from Egyptian bondage, having been guided through the Red Sea passage.
Only a couple of chapters later, however, we find those same Israelites complaining that they were better off in Egypt, that God had led them into the desert to kill them. What happened? These people forgot what God had done for them and lost their victory. Let us never forget what God has done for us - let us Hold On to the Victory!