There are two very different motivations for adapting and accommodating our message to the sensibilities of a group of people.
The first motive is 'ambition' -- we do it for our sake, for our own glory and approval. The other reason we may accommodate people is for their sake, so that we can gradually win their trust until they become open to the truth they need so much.
The first motive will so control us that we will never offend people. The second motive will help us choose our battles and not offend people unnecessarily.
The Farels of the world cannot see any such distinction -- they believe any effort to be judicious and prudent is a cowardly 'sell-out'. But Calvin wisely recognized that his friend's constant, intemperate denunciations often stemmed not from a selfless courage, but rather from the opposite -- pride.