John Calvin Commentary Hebrews 2:18

"For in that he himself hath suffered being tempted, he is able to succor them that are tempted." — Hebrews 2:18 (ASV)

For in that he himself has suffered, etc. Having been tried by our evils, he is ready, he says, to bring us help. The word temptation here means nothing other than experience or probation; and to be able, is to be fit, or inclined, or suitable.