We must give chizuk to others as it says והחזקת בו, you shall strengthen him. Just as we would help someone who was faltering physically, we must help someone who is faltering emotionally.
The great R' Michel Yehuda Lefkowitz (1913-2011), who was a Rosh Yeshiva in Bnei Brak for over 50 years, once advised a boy to speak to someone a little older than him every so often in order to get chizuk. The boy told R' Michel Yehuda that he doesn’t need chizuk. R' Michel Yehuda retorted, “I am in my 90s. And when I give a shiur and a 16-year-old boy tells me it was a great shiur, I feel uplifted. And you, who are only 16 doesn’t need chizuk?!”
Many years ago, R' Moshe Wolfson wrote a letter of encouragement to a woman who suffered a miscarriage. At a later period R' Wolfson asked R' Shimon Finkelman to translate it from Yiddish to English. After it appeared in Binah magazine, the magazine published a letter to the editor in which a woman wrote that R' Wolfson’s letter finally brought her a measure of solace after the loss she suffered. When R' Finkelman reported this to R' Wolfson, R' Wolfson responded that giving encouragement to a Jew is something big. Then he thanked R' Finkelman for informing him about the woman’s letter and proceeded to relate the following anecdote.
The Klausenberger Rebbe delivered a famous chumash shiur every Thursday night. One week, following the shiur, a chassid told the Rebbe, “The Rebbe’s shiur tonight was remarkable.” A chassid that overheard this comment reprimanded the first chassid, “The Rebbe doesn’t need your approval.” The Rebbe spoke up: What’s wrong? One can’t give a Rebbe a compliment?” R' Wolfson was implying that he too appreciated hearing what his letter had accomplished.