Natural things require no effort, salvation requires effort.
Heb 4:3....
And yet His works have been finished since the foundation of the world.
4For somewhere He has spoken about the seventh day in this manner: “And on the seventh day God rested from all His works.”
b 5And again, as He says in the passage above: “They shall never enter My rest.”
6Since, then, it remains for some to enter His rest, and since those who formerly heard the good news did not enter because of their disobedience,
7God again designated a certain day as “Today,” when a long time later He spoke through David as was just stated: “Today, if you hear His voice, do not harden your hearts.”
c
8For if Joshua had given them rest, God would not have spoken later about another day.
9There remains, then, a Sabbath rest for the people of God.
10For whoever enters God’s rest also rests from his own work, just as God did from His.
11Let us, therefore, make every effort to enter that rest, so that no one will fall by following the same pattern of disobedience.