再三考虑

wǒ zài sān kǎo lǜ zhī hòu jué dìng bù qù le

我再三考虑之后决定不去了。

After much deliberation, I decided not to go.

wǒ yǐ jīng zài sān kǎo lǜ guo nǐ de tí yì

我已经再三考虑过你的提议。

I've given your proposal a lot of thought.