JMNT(i)
20 Beautifully [put]! (Ideally [said]!; Well [conceived]!) In lack of faith or trust (or: By unbelief; Because of lack of allegiance) they are broken off (or: were broken out of the midst), yet you yourself stand in faith (or: by trust; with confidence). Stop being haughty (Don't constantly have high opinions; Do not continually think lofty things), but to the contrary, [be constantly having] an attitude and mindset of respectful awe (or: [Godly] fear; healthy respect)!
21 For you see, since (or: if) God spares not (or: did not spare) the natural branches (the branches down from, or, in accord with, nature), neither will He continue sparing you!
22 Observe, perceive and consider, then, God's useful kindness (benevolent utility) and abruptness (sheer cutting-off; rigorous severity) – on the one hand upon those falling: abruptness (sheer cutting-off); on the other hand (or: yet) upon you: God's useful kindness (benign, profitable utility), provided (or: if) you should persistently remain in (or: with; by) the useful kindness (or: = continue to be kind and useful). Otherwise you, also, will proceed in being cut out!