Growing up, I watched a lot of cartoons and it was not unusual for a character to fall over the edge of a cliff. Many times he would grab a branch of a small tree to keep from falling and then hold on until someone rescued him. The character was not going to let go of that branch no matter what happened.
We are to hold on to God like that. To let go is to give up of our hope of living with God in heaven forever. We read, That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us: which hope we have as an anchor of the soul, both
sure and stedfast, and which entereth into that within the veil (Hebrews 6:18-19). The word translated lay hold upon could mean not losing your grip. We must never let go of our hope for heaven. The only way to do that is to always study our Bible and obey what it says (2 Timothy 2:15; John 14:15). - adapted from Wisdom's Corner