From Thomas Watson:
To consider how dearly our sins cost Christ, may cause tears to distill from our eyes. Christ is called the Rock (1 Cor. 10:4). When his hands were pierced with nails, and the spear thrust in his side, then was this Rock smitten, and there came out water and blood. And all this Christ endured for us: "the Messiah shall be cut off—but not for himself" (Dan. 9:26). We tasted the apple—and he drank the vinegar and gall. We sinned in every faculty—and he bled in every vein! Can we look upon a suffering Savior with dry eyes? Shall we not be sorry for those sins—which made Christ a man of sorrow? Shall not our enormities, which drew blood from Christ—draw tears from us? Shall we sport any more with sin and so rake in Christ's wounds? Oh that by repentance we could crucify our sins afresh! The Jews said to Pilate, "If you let this man go, you are not Caesar's friend" (John 19:12). Likewise, if we let our sins go and do not crucify them—we are not Christ's friends.