The First Reading recalls the covenant God made with Noah and his family, to never again wipe out all life - all of their descendants - through a flood - setting in the sky the rainbow after rain as a reminder.
What is often forgotten is that a covenant is a sacred contract -
2 parties bear responsibilities.
We are to be the children of God, adhering to His Will for us.
Avoiding total annihilation by flood is not a one- sided promise made after God wrought fair justice on the entirety of people who chose to ignore Him before they were not saved from the flood.
Note the "clause" in the Responsorial Psalm:
"Our ways, O Lord, are love and truth
to those who keep your covenant."
There is a part to which we need to adhere. Like an older teen wanting to set his own rules, if we wish the goods of living at home,
we must live up to the terms.
We don't get to rewrite them to suit or current preferences.
St. Paul recalls Noah in the Second Reading, noting that Jesus came to save the sinners - of which there were a great many - only eight were saved in the ark just during Noah's day!
Through Jesus' suffering, not only eight are saved, but all who will turn their lives to Him, being cleansed in conscience by baptism.
In Mark's usual brief manner in the Gospel, he explains that Jesus goes to the desert at the prompting of the Holy Spirit, to withdraw from the world, fasting to help focus on God and not on meeting his personal desires. There He is also tempted by the devil, but then cared for by angels. When we follow Jesus, we too must withdraw from seeking the world's pleasures, overcoming the devil's temptations, and then we too will be cared for by angels!