Final answer:
The lines from Jose Marti's poem, 'And for the cruel one whose blows / Break the heart by which I live, / Thistle nor thorn do I give: / For him, too, I have a white rose,' best convey the message of unconditional kindness.
Step-by-step explanation:
The pair of lines that best emphasize the message that it is important to be kind no matter the circumstance come from the poem I Have A White Rose To Tend by Jose Marti, which reads:And for the cruel one whose blows
Break the heart by which I live,
Thistle nor thorn do I give:
For him, too, I have a white rose.
These lines demonstrate the message of kindness and forgiveness by showing an intention to offer a white rose, a symbol of peace and goodwill, to both a friend and an adversary.