A simile is a phrase that uses the words "like" or "as" to make a comparison and draw meaning. In the poem "Virtue" by George Herbert, the speaker employs one simile, although he uses much other poetic language and imagery.
The simile he uses is in the final stanza and says, "Only a sweet and virtuous soul, like season'd timber, never gives." This poem is talking about strength of character and virtue. All others would fail and would not hold up to Earthly temptations, the speaker states, and the world will watch sadly as those without strong virtue pass away after attempting to endure. Only the one who is strong in his virtue will stand, and the simile states that he will be like seasoned timber: wood that is fortified and able to stand fast, never faltering in his virtue.