While He walked the earth the Lord Jesus was certainly aware of the prophecies which foretold of His death. In fact, He said the following about His impending death and burial:
"For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth" (Mt.12:40).
Yet despite the prophecies concerning His sufferings and His own words concerning His death on the eve of the crucifixion we see Him praying to the Father in the following way:
"And he went a little farther, and fell on his face, and prayed, saying, O my Father, if it be possible, let this cup pass from me: nevertheless not as I will, but as thou wilt" (Mt.26:39).
So we can see that with the Lord Jesus the necessity to be crucified arose, not because of an irrevocable prophecy of the past, but instead from the sovereign will of the Father.
The Lord Jesus did not think that it was impossible that He might be spared from the sufferings so He did not think the future was closed.
So we can know with absolute certainity that the future is open.