〜さえ〜ば
as long as, if only
Noun + さえ + ば-form · Verb ます-stem + さえすれば
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さえ〜ば says one condition is all it takes: お金さえあれば、何でも買える, "as long as you have money, you can buy anything".
The さえ marks the one thing that matters, and the verb or adjective after it goes into the ば-form: 時間さえあれば, "if only I had the time"; 天気さえよければ, "as long as the weather's good".
With a verb as the key condition, use the ます-stem + さえすれば: この薬を飲みさえすれば、治ります, "as long as you take this medicine, you'll get better". With a て-form, it's てさえいれば.
Depending on context, it's either reassurance ("all you need is…") or a wistful wish ("if only…").
Examples
お金さえあれば、何でも買える。
As long as you have money, you can buy anything.
時間さえあれば、もっと旅行したい。
If only I had the time, I'd travel more.
この薬を飲みさえすれば、治ります。
As long as you take this medicine, you'll get better.
あなたさえよければ、明日行きましょう。
As long as it's fine with you, let's go tomorrow.
天気さえよければ、富士山が見えます。
As long as the weather's good, you can see Mount Fuji.