Two interpretations can be offered for the difficult poetic expression. The first supposes that circumstances and companions sometimes yield the opposite of what one asks for. The poet therefore asks for separation in the hope that its opposite—nearness—will follow, a playful literary conceit.
The second treats acceptance of the pain of separation and tears as a path through patience toward relief and joy. In this reading, enduring hardship precedes the hoped-for outcome.
Neither reading is immediately obvious without explanation. That very remoteness of inference is why the example belongs to semantic taʿqīd.