He who wants a rose must respect the thorn.

Related:

• From a thorn comes a rose, and from a rose comes a thorn.
  Greek...
• A thorn defends the rose, harming only those who would steal the blossom.
  Chinese...
• The rose and the thorn,
  and sorrow and gladness are linked together. --...
• Doubt is the key to knowledge. --
  Persian...
• He who would leap high must take a long
  run. --...
• But ne'er the rose without the thorn. --
  Robert Herrick (1591-1674) -- The...
• He that finds fault wants to buy.
  German...
• He who must die, must die in the dark, even though he sells candles.
  Colombian...
• If you want to be respected, you must respect yourself.
  Spanish...