<p>16:21&nbsp;<i>From that time</i>- Again we see the Lord educating the disciples according to a timetable. Now He was satisfied that they were convinced of His Messiahship and Divine Sonship, He felt He could move on to teach them more about His death and resurrection. This is how we were likewise taught the components of the Gospel; but we should not think that the Lord's teaching process ends there for us. He is continuing to teach us, in accordance with how quickly we have grasped the preceding elements.&nbsp;</p>
<p><i>Jesus began</i>- Matched by Peter 'beginning' to argue with the Lord (:22).&nbsp;</p>
<p><i>To explain to His disciples-&nbsp;</i>Mk. 8:32 adds that &quot;He spake that saying openly&quot;. But He has just given the impression in :20 that these things were private; He showed them &quot;to His disciples&quot;. &quot;Openly&quot; in Mk. 8:32 is a poor translation; the word is elsewhere rendered 'boldly' or 'confidently'. The words He spoke about His forthcoming death and resurrection He spoke with a boldness of spirit that came only from total faith.</p>
<p><i>That</i>- The sense of&nbsp;<i>hoti</i>&nbsp;in the context is definitely causative. The idea is that He showed them&nbsp;<i>why</i>&nbsp;these things must happen. He didn't just foretell the events of the passion, but explained why they must be.</p>
<p><i>He must</i>- The usage of&nbsp;<i>dei</i>&nbsp;is so common in the Lord's discussion of His death.</p>
<p><i>Go to Jerusalem</i>-&nbsp;<i>Eis</i>&nbsp;has more the sense of '<i>into</i>&nbsp;Jerusalem'. Perhaps He foretold the 'triumphal entry' and how so quickly, things would unlovely themselves. Such explanation was necessary, otherwise the euphoria of the triumphal entry being dashed by what then happened would've been perhaps too hard for the disciples to cope with.</p>
<p><i>And suffer many things-&nbsp;</i>The phrase is used elsewhere of the sick woman who had &quot;suffered many things&quot; at the hands of &quot;many physicians&quot; (Mk. 5:26), and yet is used elsewhere about the Lord's 'many' sufferings at the hands of the Jewish leaders (also in Mk. 9:12). Surely the Lord perceived in her someone who was sharing something of His final sufferings. All our sufferings are likewise part of His crucifixion sufferings, and if we suffer with Him, we shall also therefore experience His resurrection. That woman was therefore set up as an example of us all.</p>
<p>Mark and Luke (Mk. 8:31; Lk. 9:22) add here that the Lord added that He would be &quot;rejected&quot; by the Scribes, elders and Priests. The same word is used about the stone of Christ being &quot;rejected&quot; by themselves, the builders (Mt. 21:42). The word carries the sense of legally condemning. They rejected the sinless Son of God as a condemned sinner and demanded His death. If nothing else we learn some basic psychology- that when a person touches the conscience of less spiritual people, they are likely to intensely slander the person and effectively demand their death, which in our day may be the social death of rejection.&nbsp;</p>
<p><i>From the elders</i>-&nbsp;<i>Presbuteros</i>&nbsp;is specifically used of the Sanhedrin members. The Lord's predictions here are highly specific and detailed.&nbsp;</p>
<p><i>And chief priests and scribes, and be killed, and on the third day be raised</i>- Literally, 'High Priests'. There was only supposed to be one High Priest, but the position was so lucrative and argued over that there were a group called the 'High Priests'- so far had Judaism fallen away from basic Biblical teachings, despite their zeal to keep the details.</p>