Art thou afeard
To be the same in thine own act and valour
As thou art in desire? Wouldst thou have that
Which thou esteem’st the ornament of life,
And live a coward in thine own esteem,
Letting ‘I dare not’ wait upon ‘I would’?

Lady Macbeth, suggesting you be less of a wimp. Cf. Seneca:

You act like mortals in all that you fear, and like immortals in all that you desire.