Therefore he had to be made like his brothers in every respect, so that he might become a merciful and faithful high priest in the service of God, to make propitiation for the sins of the people. For because he himself has suffered when tempted, he is able to help those who are being tempted.Hebrews 4:14-16
Since then we have a great high priest who has passed through the heavens, Jesus, the Son of God, let us hold fast our confession. For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin. Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need.Hebrews 7:25
Consequently, he is able to save to the uttermost those who draw near to God through him, since he always lives to make intercession for them.In addition, by reminding us what is NOT ABLE, we are directed once again to the One who IS ABLE.
...gifts and sacrifices are offered that cannot (lit. "are not able to" - same word as "able" in 2:18; 4:15; 7:25) perfect the conscience of the worshiper, (but Jesus is ABLE!)Hebrews 10:1
For since the law has but a shadow of the good things to come instead of the true form of these realities, it can never ("it is never able"), by the same sacrifices that are continually offered every year, make perfect those who draw near. (but Jesus is ABLE!)Hebrews 10:11
And every priest stands daily at his service, offering repeatedly the same sacrifices, which can never ("are never able to") take away sins. (but Jesus is ABLE!)Gifts and sacrifices couldn't do it. The law couldn't do it. The same sacrifices, offered over and over by the priests, couldn't do it. But Jesus did it!
But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God, waiting from that time until his enemies should be made a footstool for his feet. For by a single offering he has perfected for all time those who are being sanctified.